I was looking at my zoanthid in my tank last night and I notice something behind him. I thought it was a hermit crab's legs, and then I looked closer and I saw a claw. It's a crab! I didn't buy it so it must have been hiding in the live rock the whole time. He looks identical to my emerald crab just deep purple.
I tried looking him up and I read a few articles on crabs doing damage to SPS
. I don't currently have any SPS
in my tank. This crab's claws look identical to my emerald crab's claws. Do I need to worry about this crab? Could he be safe like my emerald? Could he be the same species as my emerald crab? I just caught myself saying "he" the whole time. We named him Shadow already.
If I see him again I'll try to get a picture.