Fish Food / Diet: The axolotl is carnivorous. Adults are best kept on a steady diet of organically raised earthworms, blood/ blackworms, and soft, sinking trout pellets. Younger axolotls need to be fed live food, such as white, blood, earth or blackworms, or daphnia.
I can see cheap pellet food being bad for them but get a good quality pellet (don’t know what kind) and I don’t see why it would be an issue. I know bloodworms are not entirely healthy as a staple food but as treats they’rs great.
the best staple food is definitely earthworms. bloodworms for babies. and they do not have to be alive, just wiggle it in front of them with some tweezers or your fingers and wait for them to smell it. then, in a flash, it's gone down their throats.