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So my conversion of the reef-ready 150-gal drilled tank to FW canister filtered tank is almost complete. I obtained two rectangles of glass from the glass shop and siliconed them in place over the drilled holes for the sump and return, and am using the additional hole with a bulkhead fitting, connecting this via a 1" flexible hose to a hose bibb spigot attached to the side of the tank stand. Now I will attach a garden hose and run it out the door to my garden and drain the tank that way instead of syphoning water out.
Anyway, I used a razor blade and got out the old silicone from the removal of the sump overflow boxes in each corner, but there is a film left behind. It almost seems to have etched the glass. No razor can remove it, and you can't actually feel it, but there is a pair of straight hazy lines in each corner of the tank. Is there anything that will take this off that will not ruin the tank for wildlife? I tried alcohol and vinegar, and they did nothing.
Anyway, I used a razor blade and got out the old silicone from the removal of the sump overflow boxes in each corner, but there is a film left behind. It almost seems to have etched the glass. No razor can remove it, and you can't actually feel it, but there is a pair of straight hazy lines in each corner of the tank. Is there anything that will take this off that will not ruin the tank for wildlife? I tried alcohol and vinegar, and they did nothing.