Seachem Flourish Excel 250ml

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  • Model: 020987
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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).

Why It's Different

The reason plants need CO2 is to produce longer chain carbon compounds also known as photosynthetic intermediates. Photosynthetic intermediates includes compounds such as ribulose 1,5-bisphosphate, and 2-carboxy-3-keto-D-arabinitol 1,5 bisphosphate. Although the names are complicated, the structures are quite simple (5 carbon chains). Flourish Excel™ does not contain these specific compounds per se, but one that is quite similar. By dosing with Flourish Excel™ you bypass the involvement of CO2 and introduce the already finished, structurally similar compounds. It is in its structural similarity that Flourish Excel™ is able to be utilized in the carbon chain building process of photosynthesis. Simple chemical or enzymatic steps can easily convert it to any one to any one of the above named compounds (or a variety of others).


On initial use or after a major (> 40%) water change, use 1 capful (5 mL) for every 40 L (10 gallons*). Thereafter use 1 capful for every 200 L (50 gallons*) daily or every other day. Dosing may be slowly increased in high-growth aquariums. For smaller dosing please note that each cap thread is approximately 1 mL.

by Brian S. on 13/6/2019

Does what it says. Super fast delivery.

by Trevor Thorpe on 25/5/2015

Arrived in less than 24 hours, thanks!

by Murat Dandin on 19/8/2014

I thank you for the shipment...

by Colin Jones on 4/5/2014

Great product. Together with flourish makes my plants healthy.

by Colin Jones on 22/4/2014

Just started shopping with aqua essentials and I love it already. Lots of fantastic products to choose from. As for flourish excel only just started using it so a bit to early to review yet, but I've read loads of fantastic reviews about it. Just ordered the flourish to go with it so hopefully they will do wonders for my plants.

by Sean Jenkinson on 29/11/2012

Not had this for very long so can't see any major difference in the plants, they seem healthy though, growing at a steady pace, delivery was good.

Ask a question about this product
Is this product safe with algae and rock shrimps? Thanks

Yes as long as you dose according to instructions, no problem

i am looking for a fertiliser for a new tank, the plants i have on order from you as we speak. I will be using a Fluval 88g CO2 kit and flora base with those plants. What would be a good fertiliser to get things going as want t grow a carpet as quickly as possible? Also if you can let me know when you have some Grade A Crystal Red Shrimp in and how long would i need to leave the tank before i could introduce them. thanks Ben

You'll need to use Neutro+ in that case and either flourish excel or Neutro CO2. We're not stocking Crystal reds at the moment but do have Cherry shrimp. You can add them 3 weeks after you have started your tank or when your nitrite levels read zero.

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