Lucky the Baby Axolotl

I have noticed that the seventeen day old axolotl, Precious and Heidi, are feeding very quickly and well now. They eat a small piece of blood worm immediately when it is offered. Lucky, however, still takes quite a bit of patience to feed. I move the food very slightly in front of him until he takes it. I can't always get him to take the food, so I just keep offering it to him as often as possible. I worry about him when he won't eat! I am hoping that he may just be a little behind developmentally, as he was the last larva that I broke out of the egg. He wasn't out of his egg until nearly a week after the other two. He is the same size (about 2cm), as Precious and Heidi, and is swimming well and darting about like them. When I get home tonight I will try him with some boiled egg.