I've been at war with algae in my 20 gallon tank for so long now it's almost become a part of the tank in my mind. I NEED to get this out for my sanity's sake. I've only been giving the tank 6 hours of light, with no sun on it for a year, I've tried powerful filters, and even bleached the tank and started from scratch. Can anyone tell me what my algae is and how to fight it? It's thick and blanket-like. it webs across my driftwood, and even carpets my substrate. please help- I'm desperate.