newbie looking for feeding a redfoot

[dowdys]

Hi im Laura, i have a 7 year old redfoot and I need advice on feeding him at the moment im feeding the following

pinkies (mice)
oranges
strawberries and a few other berries
lettice
mushrooms
tomartoes
cucumber

can anyone suggest any other food i should be feeding as my redfoot aka crabtree ( i didnt name him) is ill with a respiratory problem

hes on loarge bark substrate and he has a uv and heat lamp

HELP

thanks laura xx