I use a couple of short pan head screws, sort of like billdogg suggested. It give me peace of mind knowing it's not going to fall off into my sump!
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Tom
Current Tank Info: 210 SPS dominated tank w/ 350G in-system; GSA custom-12 Skimmer w/ 2 modified DC-6000's; running kalkstirrer & Ca Reactor; cabon & biopellets; ozone; Reeflo main pump.
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