OK, so BBA officially owns my tank. It is back now for the fourth time. It is mostly on the tallest plants which are of course very close to the light. It is a 125 gallon tank with a lot of swords in the tank (See Journal). I do have a CO2 tank running, but I will be honest, I have never ordered the recommended water to test the CO2. I have gradually raised the CO2 over the last week a little while making sure the fish do not seem troubled. I think I have 2 issues. One is dosing. I have no strategy, I am simply dosing the same amount of PMMD and Phosphates daily. I do a water change about once every other week. I am uncertain how to test if I am putting enough ferts in. The other issue is the CO2 amount. Without the recommended water I do not know if I am set or not. I did try one of the drop checkers with the water that was in the tank before and it was green, but since there are too many variables without the right water I just took the drop checker out. I got some hydrogen peroxide and I will test it on a leaf to see if it kills the bba, anxious to see if it works. But I am far more anxious to get to the root of the problem. In regards to tests, I have the following that I can run if need be: Iron Ammonia pH Nitrates Nitrites gH PO4 Any of those tell me if I am dosing enough? I have gradually increased the dosing over the last 2 months now that I have a CO2 tank and the plants are exploding and getting bigger. Also, one question that I think has absolutely NOTHING to do with algae in the tank, but I figured I would ask just in case. I have 3 large plecos in the tank that I feed with algae wafers every night. Does that have any effect on algae in the tank, bba or others? Thanks!!!