Theres many other safer live things you can feel other than feeders, like ghost shrimp, they're not that easy to catch either so you'll be letting your ray use it's "hunting skills" and you can gutload them before you feed them. The thing is, you'd be doing your fish a bigger favor by giving it high quality food such as pellets, or fresh fillets, shrimp, worms than feeders. Just a thing to keep in mind, all it takes is one bad feeder, unless you're planning to breed your own which is a pretty big waste of food. Then you have to deal with the thiamins, therefore way too many things to worry about feeding feeders.
