Right now i have two tanks.  12 g i have two cleaners and a peppermint shrimp.  The two cleaners seem to be the dominant guys in there.  The peppermint is hanging in.  I put hm in there to get rid of my Aiptasia.   used to have a a cleaner and a Fire Shrimp in there but the tank crashed when my Anemone died.  YOu can guess what happened to them.   :cryinga:  they got along fine.  The Fire shrimp seemed dominant though.
In the 24 g I have 3 Sexy Anemone Shrimp, 1 Peppermint and a White SPot Anemone Shrimp (He is really cool).  I am getting a cleaner for that tank too.  They all seem to get along fine.  
I guess it all depends on how big your tank is and who goes in first.  
This link is really good for getting a background on live stock before you buy. 
http://www.liveaquaria.com/product/scat ... pCatId=525
if you do a search for Shrimp or for whatever you are looking for, more than what shows is listed.
Seeya
Tony