Tom, if he has diarrohea you must be careful of wet tail as he is new to you.
If his bottom area really looks wet, and the diarrohea is severe, he will need an urgent visit to the vet. It is a very serious illness.
If he has just had a couple of looser poops, it could be youve been feeding him too much fresh food. Stop feeding any fresh food for a while and when you do introduce some again, do it very slowly, tiny bits at a time.
As for dry food, Harry Hamster, which you can get from Wilkos in town, is a really good hamster food.
Hope he picks up soon, but I need to stress this to you Tom, if he seems unwell (hunched up, moving awkwardly) or has got a wet bottom area, please dont put off going to the vet - he may need some treatment, and wet-tail is often fatal if not caught very very early.
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