I have 1 fire, 2 cleaner, 1 pepermint, and 1 randall's pistol shrimp in a 47.5 gallon. All are getting along fine.
- a fire shrimp will not be as active as a cleaner, IE not out as much. Mine sits in his little cave most of the day, coming out occasionally. The cleaners are out and about often, but the others are not out near as much.
Also, I have been told they don;t like bright lighting. I have 4w/gall - this might be the reason he hides so much. Others have said their fire isn't out much either, though.
just my oninion/experience - maybe someone else can tell you better.