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Get some aquarium sealant, I forget what its called but the same stuff the seal tanks with and just bead that down it, let it dry and boom.
Can only tell you I have made many sumps and repairs over the years with it and never had an issue. Have used regular, plumbers, and marine versions. All with good results. My sump I used regular over 10 years ago, still as strong as day one. Also don’t do water changes so if it was bad...Amazing Goop may stick better, but is says on their label "Not recommended for any items that come into contact with food, drinking water, or animals."
Unless they have an aquarium-safe product that I am unaware of.