My dwarf refuses pellets completely. I have tried mixing them in at about 10% and he just picks around them.

How long did it take yours to accept a new food? Any tricks?

I keep reading that 15cm is the minimum, but my Syrian just builds one giant nest in the corner and ignores the rest.

Should I still fill the whole base or is a deep corner enough? He seems happy either way but I want to do this right.