I too was goign to add cherry's to the ghost shrimp tank. I'm rethinking that. I've noticed my ghost shrimp are aggressive between themselves. I have leaf litter on the bottom of the tank, and some have "claimed" a leaf and when another comes by it gets defended. I have a 10 gallon tank, and I have 3 "groups", one group lives in the plants on the left, another group lives under the leaves in the middle, and another group hangs around the java moss clump on the right.