03-26-2013, 12:19 AM
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agreed you are going to want dry fertilizers. You are missing some important macros with your current dosing which is likely your main issue, both nitrogen and phosphate(and yes those are in flourish but not anywhere near the amounts you likely need). Fertilizing using liquids is likely to cost more then you want to spend, hence why dry fertilizers are recommend. Dry fertilizers and CO2 do not have to be used together. Dry fertilizers simply give you more control at a lower cost then liquids, whether the tank be low tech, high tech, or in-between they still offer an advantage. I also suggest not bothering with anything like excel or even yeast based CO2, both are more trouble then they are worth.
Your growth should be better then that IMO, which again points to fertilizers.
My 55 gallon has almost identical lighting, 2x55 watts but of power compacts with high efficiency reflectors. This tank does for the most part get pressurized CO2, however it is not absolutely necessary. All it really does is additionally increase growth. The tank can run for months without any CO2 and be fine. I have a 40 gallon running similar high light levels, 8x13watt spiral CFLs that are 16" from the substrate, no CO2, but it is getting pretty much the full EI fertilizer dosing. This tank does have some algae, but it is only about 9 weeks old and still establishing. In comparison my lowest light tank, 1.5wpg of NO T5s, is a total algae mess