+1 on the silcone....remove the sump like suggested run carbon and do water changes....by the sounds of it you corals should come back if you do all the above....for the most part the only silicone i would use would be the stuff you get from tank builders!
the stuff from rona and homedepot and what not are hit and miss
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500G Mixed Reef
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Electrician, Electronics Technician, I can help with any electrical questions you might have!!
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Kevin
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