Hello i am new to axolotl's brought one from a pet shop about 3 weeks ago he was fine for the first week eating out of my hand but now he has not eaten for the last week and a half seems completely disinterested in food. I got frozen food from the pet shop and have tried feeding him earthworms in case he went off the food with no luck. He also seems to have a bit of a white coat on his body and sheds some kinda of white substance, I did have pebbles on the bottom of the tank but i took them out as Ive been reading he could eat them and get sick, Ive attached some photos you can see the white on him more in the white container then the black one.