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Seachem Flourish Excel 500 ml

4.7 4.7 out of 5 stars 5,063 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Aquarium Water Treatments by Seachem

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500 ml

Purchase options and add-ons

Brand Seachem
Liquid Volume 500 Milliliters
Item Weight 16 ounces
Item Form Stick
Target Species Fish

About this item

  • CARBON PRODUCTION: All plants require a source of carbon, and Flourish Excel is a great and convenient source of bioavailable organic carbon.
  • IRON PRODUCTION: Flourish Excel also possesses iron reducing properties, thus promoting the ferrous state of iron (Fe+2), which is more easily utilized by plants than ferric iron (Fe+3).
  • PHOTOSYNTHESIS: Plants must produce longer chain carbon compounds (photosynthetic intermediates). By dosing with Flourish Excel you bypass the involvement of chain carbon compounds, and introduce the already finished, structurally similar compounds.
  • TREATMENT: On initial use or after a major (> 40%) water change, use 1 capful of Flourish Excel (5 mL) for every 40 L (10 US gallons). Thereafter, use 1 capful for every 200 L (50 US gallons) daily or every other day. For smaller dosing please note that each cap thread is approximately 1 mL.
  • SAFETY: Flourish Excel is completely safe for fish, however if you have Anacharis in an aquarium in which you are dosing Flourish Excel, then it is recommended to use it every other day rather than daily.

Customer ratings by feature

Sheerness
4.6 4.6
Low light
4.6 4.6
Easy to use
4.6 4.6
Stability
4.5 4.5

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Seachem Flourish Excel 500 ml
Seachem Flourish Excel 500 ml
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Price-53% $11.00
List:$23.63
-41% $12.16
List:$20.66
-7% $19.44
List:$20.80
-29% $9.89
List:$13.90
$13.25-6% $17.37
Typical:$18.52
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Get it as soon as Sunday, Mar 24
Get it as soon as Sunday, Mar 24
Get it as soon as Sunday, Mar 24
Get it as soon as Sunday, Mar 24
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Customer Ratings
Easy to use
4.6
4.6
4.8
4.7
4.1
4.8
Accuracy
4.4
5.0
5.0
4.8
3.3
4.9
Value for money
4.4
4.4
4.7
4.7
4.3
4.6
Sheerness
4.6
4.5
4.6
5.0
5.0
Stability
4.5
4.5
4.7
4.7
Sold By
Amazon.com
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target species
Fish
fish
Fish
Fish
Aquatic plants
Aquatic plants
liquid volume
500 milliliters
250 milliliters
500 milliliters
250 milliliters
100 milliliters
500 milliliters
form
Stick
Liquid
Stick
Stick
Liquid
weight
1 pounds
8.8 ounces
1.15 pounds
0.29 kilograms
0.9 pounds
0.55 kilograms

From the manufacturer

Seachem Flourish Excel Bioavailable Carbon for The Planted Aquarium

Flourish Excel is a source of bioavailable organic carbon. All plants require a source of carbon. This is typically obtained from CO2, but, may also be derived from simple organic compounds (such as photosynthetic intermediates). The use of either CO2 injection or Flourish Excel does not necessarily negate the use of the other. Because the processes of producing photosynthetic intermediates and building onto them occur simultaneously, one can derive a substantial benefit with the use of Flourish Excel either alone or in conjunction with CO2 . The combination is particularly ideal for situations when continuing to add CO2 could result in dangerously low pH levels. Flourish Excel also has iron reducing properties which promote the ferrous state of iron (Fe+2), which is more easily utilized by plants than ferric iron (Fe+3).

Looking for specific info?

Product Description

All plants require a source of carbon, and Flourish Excel is a great and convenient source of bioavailable organic carbon.

For over three decades, Seachem has been a company rooted in sound science. Our experience in the hobby and an educated staff of chemists and biologists are part of the package when you purchase Seachem products. Seachem remains as one of the few surviving independent and privately owned pet care companies. Seachem is owned and operated by
hobbyists. All of our employees are hobbyists who maintain aquariums at home and at the office. Seachem itself was started because one such passionate hobbyist - Dr. Leo G. Morin (Founder) - recognized that the available solutions to aquarists problem wanting. This resulted in Seachem’s very first product: Cupraplex (today known as Cupramine). Over thirty years later Seachem is still approaching old problems in a new way.

Seachem’s philosophy is that the knowledgeable hobbyist makes the best customer. This is reflected in solid and reliable customer education and support as well as products proven in science and performance. While Seachem has grown rapidly into a national and international firm, it retains the culture of a small company and is readily available to its customers.

Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 7.6 x 1.5 x 1.5 inches; 1 Pounds
  • Manufacturer recommended age ‏ : ‎ 1 month and up
  • Item model number ‏ : ‎ 116045308
  • Department ‏ : ‎ Unisex-Adult
  • Date First Available ‏ : ‎ June 9, 2004
  • Manufacturer ‏ : ‎ Seachem Laboratories, Inc.
  • ASIN ‏ : ‎ B000256962
  • Country of Origin ‏ : ‎ USA
  • Customer Reviews:
    4.7 4.7 out of 5 stars 5,063 ratings

Customer reviews

4.7 out of 5 stars
4.7 out of 5
5,063 global ratings

Customers say

Customers like the growth, connectivity, and performance of the aquarium pond water treatment. They mention that it helps improve plant growth, provides a CO2 source for plants, and does its job. Customers are also happy with color, value, and effect on algae. On the other hand, some customers have reported damage and different opinions on safety.

AI-generated from the text of customer reviews

298 customers mention273 positive25 negative

Customers are satisfied with the performance of the aquarium pond water treatment. They mention that it does its job, works well with heartier plants, and has noticeable results. They also mention that the product is easy to use and works well for beard and string algae if used in moderation. Overall, most are happy with the results and recommend the product to others.

"...I highly recommend this product to anyone who is looking for a reliable and effective solution to keep their aquarium plants healthy and free from..." Read more

"...This is an excellent, excellent product. Algae is one of the banes of aquarium keeping...." Read more

"...This stuff is amazing. They should really advertise its algae controlling properties more...." Read more

"Good value for the money and does its job perfectly." Read more

250 customers mention234 positive16 negative

Customers are satisfied with the growth of their aquatic plants after using the aquarium pond water treatment. They mention that it helps their plants thrive and sprout new leaves. They also appreciate the turbocharged plant growth and the longer, healthier leaves.

"...Not only did it help my aquatic plants thrive, but it also helped in getting rid of black beard algae which I had been fighting with hydrogen..." Read more

"...This is one of the most useful advances in aquarium-keeping in recent times.Highly recommended." Read more

"...now put them back in my tank and the BBA is dead and the plants are still doing well! I'm glad I have this on hand in case that BBA comes back." Read more

"...I add two capfuls a day and the plants are pretty healthy. They are growing slowly, but they are healthy." Read more

173 customers mention140 positive33 negative

Customers like the effect on algae. They mention that it helps a bit with algae, and it's easy to use. It really cleans up the aquarium in a healthy way, and if used, it can be used in conjunction with a good off-label algaecide. It also works to get rid of the BBA.

"...did it help my aquatic plants thrive, but it also helped in getting rid of black beard algae which I had been fighting with hydrogen peroxide for..." Read more

"...Will Excel completely prevent the growth of algae? No, it will not. It discourages algae growth, but will not prevent it completely...." Read more

"...first dose of this 6 days ago 2 things have happened: The algae has stopped spreading and plants that were struggling or just slow to grow have..." Read more

"...lost time, it takes a while, several weeks maybe but it really cleans up the aquarium in a healthy way, and if used regularly, maintains it." Read more

61 customers mention53 positive8 negative

Customers like the color of the water treatment. They say that their plants look better than ever, and are vibrant green. They've been pleasantly surprised with the growth and color rendering of their plants. Some customers also mention that their decorations look almost brand new.

"...good as in my 29 gallon tank I've been pleasantly surprised with the growth and color rendering of my plants in the nano tank...." Read more

"...use nothing but Seachem products in my moderately planted 55g. My plants look amazing and no noticed ill effects with my ghost shrimp, guppies,..." Read more

"...droppers to put in the right amount every day and it has kept my plants looking great...." Read more

"...Update: Tank is still algae free and looking great! (June 2019)" Read more

54 customers mention47 positive7 negative

Customers like the value of the aquarium pond water treatment. They say that it's worth the price and well worth buying.

"Good value for the money and does its job perfectly." Read more

"...This is an aquatic plant carbon supplement.Value? Worth every penny, even if purchased in local store." Read more

"...Nutrafin CO2 system a whirl since its not a tank system and is cheap to try. Plus it is less likely I can screw it up and kill my fish...." Read more

"...Effective and a great product. Fair price." Read more

30 customers mention27 positive3 negative

Customers are satisfied with the connectivity of the product. They mention that it helps to control algae and provides a CO2 source for plants. It is a great alternative for gas Co2 and a good way to get carbon in your tank.

"...Excel provides a source of bioavailable carbon. It is not a perfect substitute, but it is much better than using nothing at all...." Read more

"...for pressurized co2 in a high tech tank, but it is a great source of carbon for plants and even helps a bit to control algae...." Read more

"Seachem Excel is a great alternative to CO2 injection and a good off-label algaecide...." Read more

"...It will break down and does release carbon into the water, although not as well as injected CO2...." Read more

45 customers mention24 positive21 negative

Customers are mixed about the safety of the aquarium pond water treatment. Some mention that it has no ill effects to their fish, it didn't hurt any of their plants, or livestock which includes fish, loaches, cories, and invertebrates. However, others say that the content of this product can be harmful and that it may negatively impact some plants and even some inverts and fish.

"...I'm two months in and the shrimp have experienced no ill effects...." Read more

"...the amount advised, but less frequently than stated, and my snails were still affected...." Read more

"...No losses in fish or invertebrates.Now entering week three all moss has remained lush...." Read more

"...positive note... While the main ingredient in Excel is a pretty nasty chemical after doing research (don't inhale the fumes, wash your hands etc) I..." Read more

19 customers mention4 positive15 negative

Customers are dissatisfied with the damage caused by the aquarium pond water treatment. They mention that their plants died, fish started dying, and anacharis started dying. Some customers also say that the product wiped out half of their plants and started killing off their java ferns. Customers also have a hard time keeping shrimp alive and their mystery snails died in three days.

"...Then my anacharis started dying. It looked translucent and it was falling apart...." Read more

"...This was accompanied by a fish swimming erratically and eventually dying. I did an emergency water change and saved about half my fish...." Read more

"...The plants were nice but I had a really hard time keeping shrimp alive which was both expensive and disappointing...." Read more

"...It is great. After 1 day my plants had grown long roots. No plant has died so far and I atribute most of that to this fertilizer...." Read more

Black Beard Algae in my 20 Gallon Planted Tank
5 Stars
Black Beard Algae in my 20 Gallon Planted Tank
--Update--The algae has begun to disintegrate and fast. It's patchy now and coming off in clumps. The rocks pictured were 90% covered in dark hair. You can see it is no longer a healthy algae color. The green spots I suspect are cyanobacteria but it hasn't spread beyond those rocks in months. If it does I have Blue-Green Stain Remover which works wonders. After one more day I'll do a good 50% water change and my tank will be beautiful again. This stuff is amazing. They should really advertise its algae controlling properties more. I know it's not really this products job to kill algae, but it seems to be a good side effect of it helping plants grow. It really drives a wedge between aquatic plants and algae.Bought this because I got an infestation of black hair/black beard algae. It came in on the back of an assassin snail and began to cover everything. It's friggin everywhere. After research I found there are 3 options: Start over, use hydrogen peroxide , or use this stuff. Since I added the first dose of this 6 days ago 2 things have happened: The algae has stopped spreading and plants that were struggling or just slow to grow have started improving drastically. I even see a 1/4" of new susswassertang popping out of the algae that is covering it. I've never seen it grow that fast. I wish I had started using this stuff sooner. As of now the algae is not dead yet, but I'm sure it will be since it's color has changed from very dark green to a sickly light green with spots that look like rust. I'm thinking that with the ferrous iron going on, I might even see more red coloring in my ludwigia in the future. I've got tetras, assassin snails, amano shrimp and "pest snails" and they all seem unaffected by the product, so 5 stars all the way.A note about the snails: assassin snails are not a good way to control "pest snails" You put those guys in there and they go to work eating as many pond snails as they are able all the while mating and laying eggs every day. My tanks is going to crash hard when they all hatch. Right now I'm just trying to save my beautiful plants in time to migrate them and the fish and shrimps out. I'm going to migrate some pond snails over as well. Turns out they weren't pests. They were policing the algae better than anything in the tank. The assassin snails mucked that up right good.
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Top reviews from the United States

Reviewed in the United States on January 27, 2024
Size: 500 mlVerified Purchase
2 people found this helpful
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Reviewed in the United States on March 1, 2015
Size: 500 mlVerified Purchase
16 people found this helpful
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Reviewed in the United States on July 27, 2019
Size: 500 mlVerified Purchase
Customer image
5.0 out of 5 stars Black Beard Algae in my 20 Gallon Planted Tank
Reviewed in the United States on July 27, 2019
--Update--
The algae has begun to disintegrate and fast. It's patchy now and coming off in clumps. The rocks pictured were 90% covered in dark hair. You can see it is no longer a healthy algae color. The green spots I suspect are cyanobacteria but it hasn't spread beyond those rocks in months. If it does I have Blue-Green Stain Remover which works wonders. After one more day I'll do a good 50% water change and my tank will be beautiful again. This stuff is amazing. They should really advertise its algae controlling properties more. I know it's not really this products job to kill algae, but it seems to be a good side effect of it helping plants grow. It really drives a wedge between aquatic plants and algae.

Bought this because I got an infestation of black hair/black beard algae. It came in on the back of an assassin snail and began to cover everything. It's friggin everywhere. After research I found there are 3 options: Start over, use hydrogen peroxide , or use this stuff. Since I added the first dose of this 6 days ago 2 things have happened: The algae has stopped spreading and plants that were struggling or just slow to grow have started improving drastically. I even see a 1/4" of new susswassertang popping out of the algae that is covering it. I've never seen it grow that fast. I wish I had started using this stuff sooner. As of now the algae is not dead yet, but I'm sure it will be since it's color has changed from very dark green to a sickly light green with spots that look like rust. I'm thinking that with the ferrous iron going on, I might even see more red coloring in my ludwigia in the future. I've got tetras, assassin snails, amano shrimp and "pest snails" and they all seem unaffected by the product, so 5 stars all the way.

A note about the snails: assassin snails are not a good way to control "pest snails" You put those guys in there and they go to work eating as many pond snails as they are able all the while mating and laying eggs every day. My tanks is going to crash hard when they all hatch. Right now I'm just trying to save my beautiful plants in time to migrate them and the fish and shrimps out. I'm going to migrate some pond snails over as well. Turns out they weren't pests. They were policing the algae better than anything in the tank. The assassin snails mucked that up right good.
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17 people found this helpful
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Reviewed in the United States on February 24, 2015
Size: 500 mlVerified Purchase
4 people found this helpful
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Reviewed in the United States on December 7, 2023
Size: 500 mlVerified Purchase
One person found this helpful
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