Emerald crabs aggressive?

[BriDroid]

I think I’ve lost my little male emerald crab. I haven’t seen him in a couple weeks, and my spot he keeps free of bubble algae under my hammer, is coming back. Since I only have an 11 gallon cube, I don’t want to add another if he’s just hiding and then they fight. Or will they even fight? I guess if I do add one I can try to find a female?

 

[liddojunior]

They do fine together. I had 3 of them and they didn’t fight. Sometimes they just would sit next to each other munching on algae

 

[dank.reefer]

I think I’ve lost my little male emerald crab. I haven’t seen him in a couple weeks, and my spot he keeps free of bubble algae under my hammer, is coming back. Since I only have an 11 gallon cube, I don’t want to add another if he’s just hiding and then they fight. Or will they even fight? I guess if I do add one I can try to find a female?

I don't think they will fight. I have a 20g coral/invert QT. I have had as many as 15 at a time in there for algae outbreaks.