Crabs (hermits, arrowhead and emerald) eating button polyps

[ctchris]

My crabs have finished all of the hair algae inn the tank and even though i put in sea veggies and cockles they still nibble at my button pollyps.

Does anyone know how to keep them occupied with other things?

 

[rustybucket145]

Mine go nuts over a piece of frozen broccoli (sp)