BallAquatics, I sent you a PM. I am a little nervous about putting CPD's in the tank after what you said about them and cherry shrimp. Cherry shrimp are the main part of the tank and I don't want to put anything in there that will seriously endanger them. How serious would the impact be on the population of cherry shrimp and would they impact the behavior of the cherry shrimp so that they won't be out as much as well?