just to throw this out there, I had 2 cpd with about 5 sakura rcs, in a 55, started about a month ago, yes I think some of the new shrimp got ate, added a female cpd to the mix, right now sitting at about 40 sakuras. my setup is a 55 planted with rcs and cpd flowing into a 55 refugium (containing roselines, zebra danios, killis, and rasboras. some of the babies might have also went through the overflow to the lower tank and got eaten, not sure, but the cpd stay to themselves. eventually once my hc grows in more the cpd and sakura will be moved to the refugium and all the bottom tank mates will go up top