I cannot get rid of this algae no matter what i do. 100 Gal. planted tank. (4x39 watt) 156 total watts of hagen life-glo T5 HO light. CO2 is 3 bubbles per second, and this runs for 10 hours a days with the lights. Nitrate is 30ppm. Nitrite is 0 ppm. PH is 7.7. Filter is a FX5. If I do a water change of 30% a day or don't do a water change for a month nothing changes. Any suggestions would be great.
There is only one permanent fix to this problem. Sufficient aeration of the water.
The ONLY time EVER that I've seen green slime algae become a problem in ANY tank regardless of water quality is when there is not enough dissolved oxygen in the water. With sufficient aeration, it goes away completely on it's own. Without, it'll be back, probably sooner rather than later.
It makes sense, cyanobacteria require a low-oxygen environment to live. If anyone has a bead on another common and plausible cause, I'd be interested to hear it. But I've never encountered it before. The advice online is good... water quality... etc... etc. But when I see it, I'll believe it.
The fish seem to survive just fine in a low-oxygen tank covered in green slime, but mine seemed much more lively once I fixed the problem.
I realize I'm responding to a very old post. But after wrestling with the issue myself for a while, I want others who find themselves here via Google to benefit.