Swimbladder Problem

[George&Ade]

Hi.
Ive been looking through the previous questions here looking for an answer to my question,but cant find any so maybe someone could help.
Basically,one of my fancy goldfish just floats around upside down on the water surface.
He does manage to right himself occasionaly,but obviously something is wrong here.
I think it may be swimbladder problems but not sure how to treat it.
Thanks for any help.

 

[black angel]

Do you have stats for ammonia, nitrite, nitrate and ph? High nitrates can cause fish to flip over and another simple solution is diet. What are you feeding?
Flaked food is a no no for fancies as it builds up gas in the gut, especially if the water is cold. Try raising the temp and starve the fish for 3 days. If you dont feed peas, then now is a good time to start. After the three days feed them all on boiled frozen peas that you can husk and squash down so its easy for them to feed. Do this for 3 days and see how it is.