I just started my first tank about a month ago now, and it is giving me a lot of problems. I recently bought a big snail for my 5 gallon tank and my fish (feeder guppies) keep attacking the snail when out of the shell, that he is afraid to come out of its shell. Now I noticed two days ago there is green stuff on the glass of my tank which i removed with the galss cleaner. Except now i see green stuff on my gravel now. What is it and how do I get rid of it? I clean the gravel every 2 weeks and I just did it last week, I don't know what to do. Is there a chemical to get rid of it or something? I am using waste control and cycle every week is it that causing the problem? Tried Pclear and it did nothing. SO Please tell me what else I can do.