Caridina multidentata (japonica or algae shrimp, I'm not sure what name is correct in English...) are so big, brave and proud japanese firebelly newts haven't catched any - they're (shrimps) already at least six years old! In spring I bought some new but they've been on quarantine & growing for four months, they were a lot smaller. But then domestic shrimps (cherry shrimp size) with swordtail firebelly newts must occassionally end up being eaten. The population is never totally down but it won't grow as much as it could in an aquarium space enough for a huge crowd. So, I wouldn't put (all) the cherry shrimps with newts if you're not ready to possibly lose them! SFN are stronger built than JFN and I haven't tried japonica with them but they might work - which newt were you thinking with the shrimps, MnGuy? My tanks have quite a lot of plants, else I haven't done any special hiding places for the shrimps.