Mine will eat daphnia & mysis shrimp, but they will eat the bloodworms first of course. I know they also sell tubifex worms (I only buy Hikari bc it is the only one 100% sterilized), red and white mosquito larvae, and beefheart. I don't buy the beefheart from the petstore because it is way overpriced. I got my bucher at Albertson's to order some for me, and I blended it up in my blender and added some gelatin and fishy vitamins. I feed this through a syringe & needle, like for livestock, and it looks like a little worm. They really love this, almost more than the bloodworms I think. But, it's some work if you really wanted to make some it's worth it, but some people think it's gross. I fed this to juvies and adults. It is high protein, but you can't overfed this bc it will foul the water quickly if left uneaten.