Mark & Claudia Carrick wrote:

I have agold fish that started to hide in the corners of the tank about 3
days ago, he would feed when I gige him food, then back into the corner at
the bottom of the tank. Today I find him upside down and gasping for breath
??? any advice

How big is the tank, how many fish in there, do you do water changes with
treated
water and how often do you feed him (and with what). Also do you know your
water parameters (Ammonia, Nitrite, Nitrate and PH)?? This will help identify
any potential problems.