I like the emerald crabs if it is on a rock or such, but I have some growing on my seio, so I am going to have to take it out, scrub it, and give it a good ol vinegar bath.
I had the same thing in my tank few months back, took the rock out and sprayed it. keep my nitrate to 0 and they will die off. As far as the crabs go, I herd that they just pop the bubble and it will reproduce somewhere else again, so I didn't even bother.
they actually will eat the bubble. Never had an issue with them I alsways keep a couple emeralds in my tank. I guess everyone can always get different results.
One thing to remember, the crabs will get in to holes in the rock and push loose fitting frags out of his. I have 1 acro that I have to reset every couple days
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