I have a 20 Gallon tank that has green water. My Pleco seems to keep the algae off all the plants and ornaments, but my water is so green I can't see through it. pH is 7.0, Nitrites and Nitrates are 0 Amonia is 0. I have a flourestent hood that is on from 7:00 am to 10:00 pm. My LFS...