advice on a balanced diet for new hamster

[nebula]

i read that the two main causes of wet tail in Syrian hamsters is stress and improper balanced diet. i want to do everything i can to ovoid him getting wet tail.

he has hamster muesli that i buy from pets at home and i give him apple (iv only had him 7 days) he is 9-10 weeks old

what exactly should he be eating everyday/week for a balanced diet that will give him all the vitamins and nutrients he needs

maybe you could tell me your feeding routine everyday with your hammy?

thank you