Hello Okay so since I got both of my T5HO fixtures for my 34G and 45G I have had some horrible type of algae start growing in both tanks. In the angel tank I am just about keeping on top of it But in the koi tank I let it grow wild because I know the koi love it! However, once the koi are outside the 34G will be used for breeding bolivian rams or angelfish. If I breed angelfish I will want the tank to be bare bottom. So the question is, how can I stop so much algae growing? Heres a pic of the koi tank now.