My CBS was the laziest thing in the world. He didn't eat anything except for the shrimp pellets I fed him every few days. I don't think he would be a threat to the fish, even though he did snap at them a few times. If he really wanted to kill them, he had plenty of chances while they were sleeping at night (the clowns just chill on the sandbed). Of course, it might all depend on your CBS as well. Good luck, Meredith.
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