Gold fish passive, keeps surfacing, swims on one side, what's wrong with him?

friday's child

New member
My gold fish (1 year old) is quite passive today, it swims a little bit but tends to fall on one side and also surfaces every time it tries to get to the bottom of the tank. Did not notice any spots or dark areas on his body. Yesterday he ate but today i'm affraid to feed him, cuz i'm unsure what's wrong with him. It seems that he's a bit bloated, but i'm not sure. Three months ago two of my gold fish died of poisoning. I guess the water was bad, it had nitrites or smth like that. Now we use bottled spring water and add supplements to keep it healthy and also use vitamins and filter the water. I don't want to loose this fish too. Please help.
 
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