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I have like 1 or two pretty large openings in the back of my tank (glass lid). I was wondering what I could cover these with to make sure none of my fish jump out. Everytime I can't find one of them I start freaking out
Most glass tops have a plastic strip that fits on the rear so you can cut it out for the filter and heater. One of my LFS has the stuff in 10 ft. lengths. Its like .25 a foot. Maybe yours can get it for you.