Gave my leucistic female, Tenedor a bit of prawn. Worms are the best stable diet for them, but I thought I would try out a prawn today as a special treat (first time feeding one). She starts out eating sand, silly thing - then finds it.
Axolotls can swallow anything the size of their head and smaller, if we could eat on the same scale as them - we could swallow a basketball whole! This is why you cannot keep axies on gravel, as eat it, and it can impact them - often resulting in death.