I have had black brush algae in my 29 gallon for months now. It is driving me crazy! I have tried so many things to get rid of it. Excel barely works. I have to triple dose it and my crypts can't stand that. Hydrogen peroxide has NO EFFECT. Upping the flow in the tank does nothing. Increasing water changes is useless. I am running out of patience. This stuff is so ugly! There's not even that much! So my question is: do I suck it up and get a CO2 system, or is there anything else (other than tearing the tank down) that I could try? I think it might be caused by an abundance of nutrients from the special plant substrate in using, but I have a good number of plants and they just don't eat it all fast enough. Any advice or ideas would help. Thank you!!