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Seachem Flourish Excel is a liquid source of bioavailable organic carbon for planted freshwater aquariums. It gives plants a carbon supply without a CO2 injection system, and it can be run alongside CO2 injection. It also keeps iron in the ferrous form plants can use more easily. It suits low-tech planted tanks and aquascapers who want steady growth without pressurized CO2.
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Lowest price we've seen: $3.99 on Nov 13 at eBay. Tracked across 11 stores since Nov 13.
Planted-tank keepers report easier growth and less algae in low-tech setups, and many use it as a CO2 alternative. Others warn that overdosing can melt certain plants and stress shrimp and other invertebrates.
Flourish Excel is a source of bioavailable organic carbon for aquarium plants. All plants need a source of carbon. It usually comes from CO2, but plants can also get it from simple organic compounds such as photosynthetic intermediates.
Flourish Excel can be used alone or together with CO2 injection. Using one does not rule out the other. Plants produce photosynthetic intermediates and build on them at the same time, so they can benefit from Flourish Excel either way. Using both together suits situations where adding more CO2 could push pH dangerously low.
Flourish Excel also has iron-reducing properties. These promote the ferrous state of iron (Fe+2), which plants use more easily than ferric iron (Fe+3).
