Congratulations on the little axolotyl's!!! What a nice surprise to get after a hard move, the axo's didn't seem to mind all the shuffling around :) My daughter has an axo, and she works at a LFS, will ask her if she has any food ideas for the little guys.
She has Boo in a 20 long, he was eating the sand and throwing it up. He would not eat his food so she went to Lowe's and got some ceramic floor tiles. He is much healthier now. Only thing is, she has to take him out of the tank and place him in a critter carrier with some of his water to pull up the tiles to clean underneath.