If the silicone doesn't work, try JB weld. It worked for me on a busted skimmer. The key is inside and outside has to be sealed. I'm sorry but you get what you pay for. There is a local fish store by me with a 300gal reef. It has some of the nicest acropora and other various corals, without a reactor. It is maintained with supplements and water changes. This proves you don't need such a device to begin with.
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