I have a 10 gallon tank that my brother and I recently re-assembled(from a year of non-use). Our water in the tank became cloudy within days, so we cleaned it and everything in the tank thoroughly. The tank became cloudy so we again cleaned. The tank went from crystal clear to all cloudy again only hours after cleaning, but we cleaned everything well. This is obviously making us quite frustrated, and we do not know what to do. We use a Cascade 100 filter and have 3 fish: Albino cory, Velvet Sword (had two, one "jumped ship"), and a Rainbow shark. They all live well together, please help, clear and clean tank much wanted!!! ???