Currently, I have 2 CS, 1 blood shrimp, 2 anemone shrimp and one huge coral band.
Just make sure that you create more hiding place for them.
CS owns the underpart of my small cave and blood shrimp owns the cave near the sea bed.
Here, you see the crab (illegal immgrant) in the foreground and the "antenna" of the blood shrimp in the background.