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Hi & welcome to the forum

Congrats on your new Chineseys!
They should be having a good quality dwarf hamster mix ideally, that may contain a few alfalfa pellets but not many, they can be prone to diabetes so shouldn't have sugars (including fruit) in their diet but don't take anything like corn or peas out of the mix though as you won't know what they're having then.
Which mix are you feeding them now?
If you're in the UK then Burgess dwarf hamster harvest is a good mix, there are also a couple of others available from Zooplus which are quite good, Bunny Dwarf HamsterDream & JR Farm Feast for Dwarf Hamsters
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