Will an emerald crab attack my fish or coral?

[Westside Guy]

I am starting to find some bubble algae in my tank and was considering the addition of a few emerald crabs.
Will I have to worry about them attacking my fish or coral?

 

[shred5]

They can pick at coral..
Most likely not a issue with fish.
I have had them catch cleaner shrimp.

 

[Westside Guy]

They can pick at coral..
Most likely not a issue with fish.
I have had them catch cleaner shrimp.

My 2 Gladiators go to sleep on the sand bed, could they be attacked?

 

[shred5]

My 2 Gladiators go to sleep on the sand bed, could they be attacked?

Clownfish?

It really shouldn't. A healthy fish should be ok. A injured, sick or old fish maybe from a large emerald.

I wont say no because a large emerald may be able to grab a fish not paying attention or at night but I think highly unlikely.