Why is my healthy goldfish floating at the top of the tank?

I have a black moor goldfish and some times he just floats at the top of the tank (not floating on his belly) almost as if he was playing dead. He does this for a while and then comes back to his senses, it's almost as if he was zoning out. He was floating and I came over and he was kind of like "oh... show more I have a black moor goldfish and some times he just floats at the top of the tank (not floating on his belly) almost as if he was playing dead. He does this for a while and then comes back to his senses, it's almost as if he was zoning out. He was floating and I came over and he was kind of like "oh hey"

The tank is 29 gallons and well oxygenated, and the other fish are fine so it isnt a problem with water quality.
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