As for the staple food, I recommend the Belgian 1000 hamster rat food. It is nutritious and balanced. SS also likes to eat it. Of course, there are other rat food that are also good. This is what my family eats

For snacks, you can feed raw melon seeds, peanuts, fruits, mealworms...

SS is very picky about food, and always chooses delicious food, but he will not let himself go hungry, so If you leave it alone, they will always eat when they are hungry

Sometimes SS won’t eat because their teeth are too long. You need to prepare molar stones for them so that they can grind their teeth at any time

Hope it helps you~