I'm not sure what category this should go in, but I figured this is a safe guess. Move it if it's in the wrong spot, please. Anyway...I was told that with a saltwater setup, you never have to change the water. I was told the water goes through an extensive filtration system then back into the tank(I know nothing about saltwater...this is only what I was told). Is there a way that anyone knows of to do this with a freshwater setup? If so, how do I do it? If not, then could it maybe be possible(with a bunch of inventive minds on a forum thread:hihi?