I remember reading somewhere (can't find it right now) that it's not a good idea to have fire shrimp and coral banded shrimp together in the same tank. If the coral banned shrimp ends up growing larger than the fire shrimp, the coral banned shrimp could eat the fire shrimp.
I don't know how likely this would be, it might be worth looking into.
I'm looking forword to seeing some pics
Cheers