Hi amanda i agree it certainly sounds like swim bladder,we have coldwater fish,i think its a common problem with fancy goldfish,and while there are liquid medications for things like.... white spot, finn rot, and fungus,I dont think there is one for swimbladder, best ask at the petshopxxx

ok i googled this, iv seperated the fish
i gave the fish thawed frozen peas,as sugested
did not feed him for 3 days
and no improvement,
so now do i just leave him and let him get on with it????

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R.I.P My sweet Cody. xxxxx