Okay, so here is the deal. Apparently when my fish were in some one else' care the filter burst into the tank and that is how I lost some of my fish. Well I have cleaned it maybe about 3 or 4 times since then. Well I never had this problem before the "filter" burst but now I get this green algae looking stuff and can't get it to stop. I thought first it was the left over carbon or whatever. But I don't see how it keeps coming back. Then i thought it was me putting in too much aquarium salt but I stopped putting it in for a while and it is still back. Any ideas?