Red Mithrax Crab?

ShaggyRS6 · Dec 27, 2019

I just want to make sure. I have 3 of these in my tank that came on the rock! This fella seems to only eat algae, although mysteriously the last few Gorilla crabs I had left have all gone missing! I wonder if this guy would have taken them out? Or maybe the pistol shrimp? Any how this particular crab has got massive!

KJ · Dec 27, 2019

ShaggyRS6 said:
I just want to make sure. I have 3 of these in my tank that came on the rock! This fella seems to only eat algae, although mysteriously the last few Gorilla crabs I had left have all gone missing! I wonder if this guy would have taken them out? Or maybe the pistol shrimp? Any how this particular crab has got massive!

Yes.

CindyKz · Dec 27, 2019

I have 4 (I think) of those in my tank, they hitchiked in on Florida live rock. In 6 months they haven't seemed to cause any trouble but they pick the rocks constantly and I have zero bubble algae (I had a fair amount at one time). They are pretty darn big though LOL!