yes a axolotl can eat a goldfish
An axolotl eats at night
Axolotl's are typically prey to humans in the wild. They're ratchet.
Yes
Any time I think
yes
There are a couple of reasons why your axolotl might not be eating like temperature of the tank water and if the water is being cycled, and if you are feeding your axolotl only one typeof food maybe try something different,
axoltls are carnivors and shouldn't eat fruit and vegetables.
Axolotl has a good sense of smell. It can survive on very little food. It can also regenerate lost limbs.
Earthworms, Lumbricus terrestris, are the best
It's possible the food is too big for it. Try switching to smaller food items and see if that cures the 'problem'. Most animals will be able to gauge the correct size of food for themselves.
Alot of things could have been wrong. From the water temperature, to lack of food. Maybe the axolotl was ill to start with.