Predators in My Tank?

[Riclat]

Are cleaner shrimp or emerald crabs predatory?

Over the past 3 or so months I've had three fish disappear without a trace: 2 longfin cardinals and a scooter blemmy.

I've got two large cleaner shrimp and 6 or so emerald crabs. Some of the crabs are getting pretty big.

Thanks
Richard

 

[a4twenty]

emeralds are know to go after fish when they get large ..........