What kind of crab is this?

LiLinka · Mar 30, 2023

Looks like red emerald

blaxsun · Mar 30, 2023

LiLinka said:
Looks like red emerald

I concur.

Tired · Mar 30, 2023

Agreed. Generally considered somewhat reef-safe, but not to be 100% trusted.

leo12345 · Mar 31, 2023

Tired said:
Agreed. Generally considered somewhat reef-safe, but not to be 100% trusted.

Will they try to eat other crabs and fish and will I ever have to feed it? It came in on live rock so I didn’t know I had it until now.

1epauletteshark · Mar 31, 2023

leo12345 said:
Will they try to eat other crabs and fish and will I ever have to feed it? It came in on live rock so I didn’t know I had it until now.

It shouldn’t eat fish, I don’t think they become aggressive to other crabs and you should probably put a little bit of food for it to eat every once in a while. How big is the tank?

leo12345 · Mar 31, 2023

1epauletteshark said:
It shouldn’t eat fish, I don’t think they become aggressive to other crabs and you should probably put a little bit of food for it to eat every once in a while. How big is the tank?

75 gallon so it’s hard to target feed

divewsharks · Mar 31, 2023

leo12345 said:
75 gallon so it’s hard to target feed

They will eat whatever gets down to them, don't have to target feed. They also eat algae.

Tired · Mar 31, 2023

It's pretty unlikely to go after healthy fish, and probably won't go after other inverts, but there's no guarantee with these. Most crabs can't be 100% trusted.

kjkszpj9 · Apr 1, 2023

dang, i wish my emerald crab was red. Lucky you.

leo12345 · Apr 1, 2023

kjkszpj9 said:
dang, i wish my emerald crab was red. Lucky you.

You can get one from kp aquatics for 5 bucks

blaxsun · Apr 1, 2023

leo12345 said:
Will they try to eat other crabs and fish and will I ever have to feed it? It came in on live rock so I didn’t know I had it until now.

No. They're generally harmless towards other livestock. They can sometimes (rarely) go after corals, although I've never experienced this myself. Most times you'll see them amongst corals picking tiny morsels of food from between the polyps.