Originally Posted by niko
Controlled light really messes algae up
. It may not preven them 100% but it keeps them "weak". After several weeks of such weakened state I've seen them completely disappear from a tank, literally in 1 day. From that point on the tank is very, very stable and beyond clean. I have 2 such tanks here at home that have undergone that kind of development and I abuse them badly (irregular maintenance). The only problem is starved plants and slow growth but never algae.
I've seen this too. This is perhaps a bit off of John's topic, and deserves its own thread, but it's almost as if some signal tells them to pack up shop and leave town. It's a very intriguing phenomenon.