bloodworms, brine shrimp mainly.. just about any frozen meaty food will usually be taken. Some will also take a HQ flake food high on the meaty side. If those fail, live blackworms. I would also avoid live fish, but more for the potential for diseases transmitted. My TT takes a variety of foods includeing guppies/mollies/platies That come from my livebearer tanks. I've also minced nightcrawlers finely, but it's messy and tbh downright gross.