Which species of daphnia did you feed to CPDs??I've fed daphnia to CPD's numerous times, and even if they are too big, the babies are more than fine for them in regards to size. If you just take a scoop, you're going to get babies for sure. The adults will not spoil the water if left in there, and if they don't get filtered out, they can/will produce offspring in the tank which the CPD's can snack on at will.