I now have 4 emerald crabs in my 80 and I rarely see them in there either. Sometimes when my lights go out for the night I'll catch sight of them but that's it. I wouldn't say I have a big bubble algae problem, but I definitely have some for sure. It seems like the crabs don't target the bubble algae but when they come across it they will eat it. So for now I think they have my issue at least in check.
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