:;toast Hello, So I have an idea, and I'm not sure as to how valid it would work, but I guess I should ask anyways? Could you use saltwater cleaners (lets say oysters) as some sort of filter for a fresh water tank? Like maybe use a regular filter (the whisper kind maybe), but instead of a filter, use them to clear the water? Obviously they need salt (the oysters), maybe add that after the water gets sucked into the filter,but couldn't you put a net or something after the oysters to catch the leftover salt, and their eggs? This sounds like its really confusing, but any thoughts???