my fish stays at the top of my fish tank help! i think he is sick!!!?

Nathan

New member
also, he was just hiding under a sheshell and kind of lying on the top resting,
hi, my small goldfish like fish is just staying on top of the tank, kind of on his side. he has black spots on the top of him that he didn't have 2 days ago, also. when i move something, he swims down, but after a while he floats up again. i have a bubblier, and he is a cold water fish. its 72 degrees in the tank, and my other fish is fine. right now, he is swimming down but he just floats up again.
he is not dead yet!!, i am wondering if he has gas or something, because he swimms all the way down and just floats up again
 
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