OK as far as my experience with a CBB and crabs, I got some live rock over a year ago that was full of crabs. Trapped about 12 of them before I gave up, there were too many crabs to count. Then never bothered any corals or fish but they ****ed me off by eating the coralline algae.
Since I got my CBB about 2 months ago I have seen no more crabs at all. I presume the CBB hunted them all down. But I thought CBB's only ate smaller stuff.
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