Hello all, I have a 90 gallon with 1 Amazon Sword, 4 Anubias, 3 Crypts, 1 Marimo ball, 1 Corkscrew Val, 2 Dwarf Subulatas, and 1 Dwarf Lily. I have 3, 48" T-8 light tubes over it with a total wattage of 96W. I use tap water (hard and alkaline) and dose only Seachem Flourish as per the bottle directions. Would Co2 benefit me? Ive read about Flourish Excel, but it seems that pressurized co2 is the cheaper route in the long run. Is co2 even needed on this tank? Ive also been battling blue/green algae for @ 8 months now too. Would pressurized co2 help with that?