I went throught this a few months ago while I was trying to repair my solana. I ended up using 3oz tubes of AGA silicone. I know there is a Dow Corning black silicone that is aquarium safe but you would have to do some searching.
Grainger sells the Momentive RTV-103 black caulk gun sized tubes for only $8.99. Just call your local one in advance so they can make sure to have it ready for you.
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