I had one that was brown that looked just like this. I forget its name though. Not reef safe. But you can safely put them in fish only tanks. They're soft coral eaters and an uncommon relative of the mithrax crabs. Gets about 3 inches across. It'll be fine in your sump
I find it amazing that I can't ID this guy. Wasted, I mean spent a lot of time with google images. Nothing. He's in a 29g with a few other inverts. Hides all the time. Oh well!
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