I have this beautiful orange male guppie named Hoss. He is in a 6 gallon tank with another male guppie, Little Joe, and a Dwarf African Frog, Kermit. His tail has become ragged. We cleaned out the tank not long ago and I was gone last week and had someone take care of them and now the tank is GREEN! so green and brown! It has NEVER done that before! I don't know what is wrong with Hoss! He is swimming and eating fine. Does anyone know?