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Your cart is empty. 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.
Darren
Reviewed in the United States on March 7, 2025
Didn’t really notice a difference
B. Hinksman
Reviewed in the United Kingdom on February 4, 2025
Very good for tank plants , they are now looking dark green
Amp
Reviewed in Japan on June 23, 2024
Written on the title that this product is 500mL but in reality I got 250mL. After I check the details one more time, there is one misleading information on the description that this product is actually 250mL. Please fix the title information about this product
thomas plang
Reviewed in the United States on October 6, 2024
This plant fert coupled with the flourish counterpart grows any simple species such as: Anubis, hornwort, java ferns and many more, VERY QUICKLY. I chopped off many of the dead leaves on my Amazon sword and it grew back in just 2 days with moderate lighting.
charpentier
Reviewed in France on September 10, 2023
conforme livraison 20/20 a voir !Super produit au bout de huit jours, je n’avais plus de d’algues sur mes vitres , mes algues en grosse quantité sur mes plantes ont commencé à changer de couleur (rouge) au bout de 15 jours puis tout disparaît tout doucement sans aucune perte sur mes poissons, mais aussi à toutes mes crevettes très nombreuses 20/20 je recommande
Cliente
Reviewed in Brazil on July 18, 2023
Não faz milagres, mas ele “mata” as algas filamentosas e peteca (claro que não é do dia para noite). Como eu apliquei: desligar filtros e qualquer outro tipo de correntezas; aplicar o Excel bem em cima das algas e deixar agir uns 5min. Após, religarmos filtros normalmente.
Fernando Ledesma Morales
Reviewed in Germany on February 14, 2022
Perfect!!!
TAB
Reviewed in the United States on July 23, 2019
I bought this to help raise the carbon in my freshwater planted aquarium and hopefully kill off some of the beard algae that had taken over. It works well. It definitely does the job of raising the CO2 but I have not had any luck in it killing the beard algae. The plants seem to be happier and growing great since adding. Product came as pictured and undamaged. Would highly recommend.
Glen
Reviewed in the United States on March 3, 2015
I wasn't too sure about liquid CO2 in a tank with inhabitants, specially since there have been reported deaths all over the internet/forums. I have been using this for about three weeks and I can confirm that I have seen substantial growth in my aquatic plants (including heavy root feeders). This stuff does work. My pH levels have not been altered, and parameters stay the same. However, I do follow the dosing directions, being careful not to overdose. A little bit goes a long way for a small tank. So far I have had no ill effects on an electric blue ram fish and invertebrates/shrimp. Just follow the dosing instructions and keep up with water changes.
A. Yang
Reviewed in the United States on March 11, 2015
This stuff works. Initially I wanted live plants to reduce the diatom and green algae bloom that seemed uncontrollable. For 5 months, i would scrap the algae off the glass and ornaments on a weekly basis only to watch the algae grow back in a few days. After months of slowly adding plants, I noticed none of my plants were growing. After doing some research, I came to the conclusion mtank had insufficient carbon. Not wanting to set up a carbon injector, I read Excel can substitute injecting carbon for plant grow. After carefully dosing at 1/2 of recommended dosage over a couple of weeks just to be safe, my plants exhibited noticeable growth. New stems and leaves developed and existing leaves looked greener and healthier. As an added benefit, the green spot algae that I use scape off the glass every week started to disappear. I haven't scaped my glass tank for several weeks now. So little algae exist now that I have to worry about my octos not getting enough food.
Adobe Gardener
Reviewed in the United States on October 18, 2015
In combination with either Flourite or Eco-complete substrates, I've used Excel for years for my planted tanks. With zero buffering capacity (kh) in the pH 8 well water I had, using a CO2 system guaranteed gorgeous plants but dead fish because of the resulting the wide swings of pH. Excel allows me to have a low tech tank and works wonders for the low to medium light plants that I prefer (crypts, anubias, java ferns, along with higher light wisteria and egeria densa used to combat algae from getting established before the plants do). I now have pH7 water with 2 degrees of hardness and will continue with Excel. For my latest tank (20 long), I've been adding 2ml every day -- it took a month for the plants to establish and start growing. I'll taper off to every other day soon. I expected the crypts to completely melt when first planted because, well, they are crypts and that's what they do. But they didn't melt and are already putting out new leaves and coloring up nicely. This tank also has 2 small Amazon swords planted in the higher light areas of the tank -- they lost their original leaves (they were grown emerged) and now have beautiful truly submerged foliage. I don't have any luck using liquid fertilizers or laterite - I'm amazed at all the different kinds of algae I managed to grow when I used them. By using Excel and adding Osmocote pelleted fertilizer deep under the substrate just where heavy feeding plants' roots are, that seems to limit excess nutrients. I've heard that egeria densa doesn't do well with Excel but mine is doing great and growing like a weed while floating over the top of the water. It's never affected my fish, snails or shrimp either.
Drakkenfyre
Reviewed in the United States on July 31, 2014
I haven't used this long, but I have enjoyed the results so far. I have several plants in a 2-gallon Betta tank. I dose the tank with Flourish, Flourish Iron, and this. And I have seen growth within the first week. I have to dose in very small amounts (1 drop is less than half the recommended dose for that size, two drops is too much) but I do see a difference.I have avoided Excel for the longest time because I heard the stories of people overdosing (accidentally or not) and killing everything in their tank. I can dose correctly, but I didn't want to take the risk with something so dangerous to tank life even if slightly overdosed. I am currently cycling the tank that the plants are in, so no fish yet, but I am sure it will be safe even at the recommended dose, let alone half it.I see lots of people saying they "prefer Excel to Flourish." They are completely different products. Flourish is a micro trace element fertilizer. Excel is a carbon-providing fertilizer. They can be used in conjunction, or separately, but they are separate products. They should not be compared "one or the other."The active ingredient is actually a sterilizer, and is used in some algaecide products. So this means yes, it can be used to kill algae. However Seachem does not market it as such, so you will find no official approval of the product as such from them.The bottle, unlike other Seachem product bottles, contains a ratcheting child safety cap. I see some people say it breaks easily on them, but I haven't had mine break yet. This has a cap like that for a very good reason. This stuff could be dangerous. Not only can some people react to it if it touches their skin or they breath it, but it should be kept well away from anyone who might think it would be a good idea to pour it in a tank, because "it's a fertilizer, so it'll be good for the plants." All fertilizer products should be kept up, but if you overdose with Flourish, you are likely only to have an algae problem if you don't do a water change soon enough. If you overdose with Excel, it will kill everything in the tank.
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