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It's 20 gallons and I do water changes every 2 weeks and I change all the water but I leave a little of it so they can keep some bacteria in the tank

OK SO MY GOLDFISH HAS BEEN LIKE THIS FOR A WEEK OR SO HIS SIDES ARE BLOATED AND HE STAYS AT THE BOTTOM OF THE TANK OCCASIONALLY GOING TO THE TOP FOR AIR I THINK AND THEN FLOATS DOWN TO THE BOTTOM AGAIN. HE HASNT EATEN FOR A WEEK AND HIS UNDERSIDE AND EDGE OF HIS FINS ARE TURNING WHITE. HE IS...