I am currently battling a few crabs alot bigger then that one. I am planning on putting them into the refugium with a few other hitchhiker crabs when I catch them.
I figure that the only reason that they are in the tank is because I put them there, thus I have a responsibility for their survival.
In the refugium they have no opportunity to get back into the display, and can do nothing but feed on algae and detris that makes its way into the sump.
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