K. Just curious. Hope you get your tanks running better. The biggest thing with saltwater tanks is that you almost never change ANYTHING fast. That'a about the only hard, fast rule there is. Also, notice that I said "almost." Yep, that's right, even that one isn't always the case. The advise that you've gotten on your 12 gallon are pretty good. Get it cleaned up, and let it cycle again, along with frequent water changes. As for the 55... What seems to be the problem there?