I wouldnt put anything else in with him untill you fix him.. Sounds like he might have a case of Swimbladder, try not feeding him for a few day then feed him shelled peas for 3 days. This should help, what kind of food are you feeding him, the best kind is a sinking pellet and you should soak the food before you feed it to the goldies that way they dont swell up in their bellys. What size tank are you cycling for him to live in cause that will determine what you can have in with him.
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10 Gallon
60 Gallon Tank
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