Some questions on Inverts

[scubasteve]

I decided that getting some inverts for my tank would make a nice addition.
I noticed on liveaquaria that you can get a horseshoe crab, has any one gotten one of these, what size tank do you need, or do you know if it will attack the fish.
i was lookin at sea urchins also, any one have experience with these?
what other inverts can i get that will make a nice addition, all i have now is a couple snails.

My tank is 72 gallons.

 

[possum]

i think horseshoe crabs are pretty hard to keep get huge and will destroy your tank

 

[e-cat]

i hear that horse shoes will topple over your rock work when they get big, and spend a lot of time hidden in the sand. get some hermits, cleaner shrimp, brittle star fish, blue linka star fish mabey a spider crab, all depends on what kinds of fsih you have, what is in the tank now?

 

[Sneaker]

I have a Banded Coral Shrimp my mate bought me for my birthday and he is beautiful, hides a lot during the day but comes out during feeding and he is peaceful with corals and everything else, cleans up a lot too...