Does shrimp and crabs get along?

[gilly]

planning to buy a fire and cleaner shrimp in my 25 gallon tank but i also want a crab too. Passed experience i have put both in and my shrimps were eaten up. What about a long nose urchine would that eat up my shrimps.

 

[quarryshark]

The urchin won't bother anyone. I assume you mean longspine.
As for the crab, depends on which kind you want. What do you have in mind?
An emerald, porcelain or a hermit would do fine.