When I used Magic Eraser on my 65 Gallon, It was just at the water line. I did it fully set up as a Reef, had a Syphon going to a filter sock in the sump. Did 18” on the front waited and repeated. Did 22” on the side, waited and did the other side. Did half the back water line at a time. One time my GSP Closed up for a week, but sometimes that happens regardless.


