Ok so I need to clean my tank, I used to clean it by taking the fish out and changing the water, all at once (now I know better). Its a little 5 gallon tank so how do I clean it. Are there little water vacums you can get for it..what should I do to clean the tank...It doesn't look like it needs it the waters crystal clear, it has a very good filter with even bottom filtration, and it doesn't smell but he poops alot. Would the filter get rid of the poop. Oh I just need to know how to clean it, or am I just supposed to clean the water if the tank gets dirty murky, or smeely. HELP!