I have three shrimps, fireshrimp, skunk cleaner and coral banded in 20g long..
they are not bother each other at all..each one stays in his own spot.. no fighting, I have them for a long time
They are doing fine..one trick to keep them not fighting is not to feed them at one spot..
I have three shrimps they are in three different spot I drop food in each spot and they get used to it..so no fighting for food no bothering each other...