Planted Tank Guru
Join Date: Dec 2006
Location: New Orleans, LA
Your filtration doesn't suck and you aren't overstocked, so it has to be the light.
Probably go with just one light on for part of the photoperiod. I'd do one on 8 hours and both on for 4 to start. Wait a month, then adjust the second light up in hours if needed. Trim BBA infected leaves and do an excel overdose (2x instructions for a few days, increase surface agitation/bubbler at night, watch fish, etc.) to kill all the existing BBA.
Long term, try to get a real co2 tank (at least 5 pound, 10 or more is better... the biggest that fits in/behind your stand)... cheaper and more convenient. Fyr Fyter is the best place to fill locally.