invert tank mates with sharks

[ams153]

i want to get a couple of tank mates for my shark but im not wanting to get a ray yet.. i want some inverts to use as tankmates but im not sure how well this would work out how would things like horseshoe crabs or somekind of lobster do with a shark? any other suggestions of cool inverts would be awsome pics even if possible thanx a ton
Andrew

 

[jcrim]

I have a conch, sandsifting star and chocolate chip star with mine.

 

[gasguzzler]

I kept horseshoe crabs with mine. Theyre pretty fun to watch. If youre going to be keeping a ray in the future, you are somewhat limited.