I just got these big red hermit crabs... it will be almost impossible for these guys to get eaten! they havent left each other side... they have been feverishly combing the sand... check out their blue eyes!
I have three of those blue eyed hermits. They're pretty cool, no match for big triggers. My big titan always carries the hermits around the tank. They are excellent sand filters for algae, however they don't eat meaty foods. They cost about $10
the titan stacks the crabs with other baseball sized live rock near his cave. whenever they move he lunges at their claws and flips the shells over in search of food.