ID this crab; good or bad?

[BL1]

So, I added a shrimp in the tank 2 days ago and ever since then at least 3 crabs have been creeping out of their crevices. I know I've got one gorilla, and 2 of these:

 

[Brian_G]

looks like an emerald to me. but its still a bit hard to tell

 

[EliWhitney314]

Kind of looks like an emerald crab, but it's hard to tell.

 

[EliWhitney314]

Hahaha nice Brian.

 

[Brian_G]

haha thanks eli!

great minds think alike ;)

 

[EliWhitney314]

I guess so.

 

[VAreef]

What are all the little purple stalk like things growing on your rock?

 

[BL1]

Are all emerald crabs greenish? Because these guys are pinkish ... and have some hair on their legs. I'm trying to get a better pic but every time I get near the tank they hide again

 

[BL1]

What are all the little purple stalk like things growing on your rock?

I'm not really sure, they were all on the rocks when they came from TBS. but they're pretty cool, the tips glow a bright pink under the moonlight LEDS

 

[Bifferwine]

I think they look like emeralds too. Emeralds can come in all sorts of colors -- gray, green, blue, red, black...

 

[Brian_G]

maybe its branching coraline? ask yote, hes an expert on that one

 

[VAreef]

I'm not really sure, they were all on the rocks when they came from TBS. but they're pretty cool, the tips glow a bright pink under the moonlight LEDS

they are very cool thats why I was wondering LOL I want some

 

[BL1]

I think these pics show him a little better ... it's ok to leave emeralds in right? I read this on live aquaria, "
Care needs to be taken to ensure an ample supply of food is available for the Emerald Mithrax Crab. Many aquarists supplement the Emerald Mithrax Crab's diet with dried seaweed and chopped meaty foods, such as shrimp, as well as a quality pellet fish food.
Otherwise, this opportunistic feeder may turn to corals, invertebrates, or small fish for a food source. However, when well fed, most Emerald Mithrax Crabs are very tolerant of their tankmates and highly compatible in reef environments. Like other invertebrates, the Emerald Mithrax does not tolerate copper-based medications or fluctuating water parameters."

 

[EliWhitney314]

Sounds pretty good to me.

 

[XxKnuckleheadxX]

i would say its a gorilla crab

 

[BL1]

I'm pretty sure it's not a gorilla, they are hairier ane the tips of their claws are black

 

[Bluespace]

I think I remember yote saying if the claws are sharp and pointed chances are it's a bad crab.

 

[dcantucson]

+1 Bluespace.
Check its claws out.

 

[yote]

Yep,check the claws.

The stuff Va asked about is the stumps of some kind of macro algae.

 

[BL1]

I guess it's a common thing on TBS LRs. they had this pic on their website, I'm assuming this is it