Well, like everyone says, most fish will eat anything that fits in its mouth. That being said, cherry shrimp get about 1” long at most which will probably be too big for most of the fish you have there (depending on the size of your platies, I only say that because I’ve seen platies that were 4 or 5” long and about as round as a large goldfish). I would test the fish with some ghost shrimp or something like that to see how they react. They might be fine in which case you can trade the ghosts for some cherry’s. Also, providing plenty of hiding spaces would be key to allowing them to cohabitate well with little to no fighting (or eating). Hope this helps!