him6616
New Member
I just got a 90 gallon tank and have crushed coral in the bottom, about 70 pounds or so. I have about the same amount of live rock. I got RO water and all of my levels are great. But all of the sudden, their is RUST all over my tank. It isn't hairy or really slimy, it is just covering everything. Any idea on how to get rid of it or even what it is???