I had good success with buying bulk clams from superstore. Most of them would survive in the sump in a basket so I'd just take one out every couple days and run it under hot water until it died. Then I'd crack it open just enough so the CBB could get it's beak in there while most other fish couldn't. He'd feast for hours. If you keep rock in your sump too, you probably notice small feather dusters grow all over. Every once in a while I'd take a smaller piece out put it in the main tank. He'd clean it up within a few days. Good luck.
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Jason
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