Here's my 2 cents if you are worried about the tank not running as in through overflow to sump scenario the main reason your concerned is the lack of oxygen in your tank. If you use your power heads to break the water surface it will help keep oxygen levels decent in the tank and for added good measure throw in an air stone or two with this you should be good to go for 24 hours without its regular flow so to speak.
If you are still concerned have a fresh batch of salt mix ready to go and in 12 hours do a waterchange to refresh the water and by then even at 12 hours the silicone should be fine it's not like you are re sealing the whole tank and have massive amounts of silicone all your using is a small dab to hold a hook.that little amount shouldn't bother anything even after 3 hours no more than using two part epoxy and crazy glue to glue frags
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