Rudi dietary improvement help

[Akuma223]

I haven't a clue as to the gender, and I know mice aren't the problem it's the conditions. I simply want to change his diet a bit

I do feed quail chicks at least once a week, I would like to breed them so I can get the eggs too. Is it possible to buy fiddler crabs in large quantities?

Does anyone know if it's possible for me to get Oliver to enjoy his crayfish? I have a small bag full of different sizes and don't want to just give it away.