I cut a piece of 3 mil contractor bag and used rubble rock to hold it in place over two spots in my 30 gal Peninsula tank. My plan is to leave it there for 3 to 5 days. This way I don't have to black out my entire tank. And I'm not sure I want to try to raise magnesium levels especially with my RBTA. But if this don't work I just might have to. I would just take the rocks out that have it and scrub them but its just too much of a pain and my rbta is on that one. Just curious if anyone else had tried this and had luck, or if it raises any red flags to experts.


