OK i added the salt do i have to do a water change later after the salt. I do a 25% every saturday should I just wait till next sat. also I think i'm going to build a small indoor pond, what would be a good size for all my rays. i have 6 of them right now. but it can't be to big i have a subfloor in my basement and i do not want it to fall through. I was thinking 10 foot by 10 foot and only about 24 inches tall would this work?