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You really dont want grooves and such or else it will have growth and as such get stuck on there. Mine is snug between overflow teeth and glass eurobrace. It does not shift at all unless I move it. I do have to flip it every 6 months or so to avoid a slight bend in the cover.
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150 SC tank build: http://www.reefcentral.com/forums/showthread.php?t=2550948
Some have bar tabs. I have a coral tab at my LFS. Life goals.
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