Seachem Flourish Excel
Bioavailable organic carbon source for the planted aquarium
Use as an alternative to CO2 injection or in addition to it
Introduces photosynthetic intermediates
Product Overview
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™ in combination with CO2 injection.
| Feature | Description |
|---|---|
| Carbon Source | Bioavailable organic carbon |
| Compatibility | Can be used with or instead of CO2 injection |
| Function | Provides photosynthetic intermediates for plant growth |
FAQ
Can Flourish Excel be used with CO2 injection?
Yes, Flourish Excel can be used with CO2 injection. The two methods complement each other and can provide enhanced plant growth.
Does Flourish Excel replace the need for CO2?
No, Flourish Excel does not replace CO2 entirely. It serves as an alternative or supplement to CO2 injection, supporting plant growth through organic carbon sources.
How should Flourish Excel be dosed?
Please contact customer service for specific dosing instructions based on tank size and plant type.

Stewart Sutherland –
I’ve been using Flourish Excel in my planted tank for three months. My plants are growing faster and the coloration is much more vibrant. I still use CO2, but the combination has made a noticeable difference in plant health.
Lisa Fisher –
It works well as a supplement to my CO2 system. My stem plants are thriving and the water clarity has improved. I didn’t expect such a strong effect from an organic carbon source.
Katherine Sharp –
After switching from pure CO2 to using Flourish Excel alongside it, my aquarium plants have grown more evenly. The leaves are fuller and the overall plant density is better.
Simon Dyer –
It helps a bit, but I noticed the effect is more noticeable in high-light setups. In low-light tanks, the improvement is subtle. Still worth trying if you’re looking for a low-maintenance alternative.