Goldfish Bottom aquarium floor

Goldfish on bottom of aquarium floor

The past few weeks I have been having problems with my goldfish on bottom of aquarium. I have maintained my water parameters (kh=137, gh=322, ph=8.15, nitrates=5ish; no nitrate, chlorine, or ammonia) the water is Crystal clear and temp is about 71-72. There is no sign of fun damage and the gills are normal. He sits on the bottom and kind of hops around. He swims to the top and grabs an air bubble then swims back down and holds it for a while then blows it out and does it again

Goldfish bottom sitting

He has done this before but recovered within a week or so. This time he is staying like this. It has been almost a month and I am truly at a loss as to what I can do. I have dosed with chlorophyll, aloe, melafix, pimafix, I have tried different water change intervals. I have given him a salt bath.

Goldfish on bottom

Nothing seems to help him. I have tried only feeding breakfast, (only a few peas). I don’t know what else to try. Any suggestions? I’m worried about my little guy!  :unsure:

Goldfish on bottom