Live black worms and pray they eat anything else. I have had a lot of success with hikari sinking bio gold for pellets. Also the word teacup is offensive to most ray keepers so look through threads on retics and find out all you can they are not for beginners. Rays in general are the toughest animal I have ever kept
OK gotcha I apologize if I offended anyone that's all I've know them by. I've had a retic before. He ate small crayfish and small fish, earthworm pieces occasionally. He got killed by a breeding pair of jags.