Help and Advice

I've just bought a sea hare to get rid of the hair algae growing on my live rock. Stuck it in the tank and all was going well with my new aquisition chomping away for England. Then one of my cleaner shrimps appeared and became very interested and "attacked" the sea hare. Sea hare went into the rock work to hide. When it appeared again exactly the same scenario. My question is whether my sea hare is in any danger or is it resiliant enough to resist the attention of the shrimp?

Thanks for any...