I have a fantail Telescope fish I have had over a year. I have him in a 30 gallon tank with one other. Both healthy and swim normal. But lately one has been sleeping up side down after he eats. He only does this after he eats. I give him peas and then the next morning he is fine again. It seems like he gets Swim bladder after every feeding. I made it a point to not feed him for a day them made sure he ate only one pellet of food the next day. And again he slept up side down. My tank is well filtered with a power filter at each end and one in the middle which makes for a cleaner tank and less waste in the tank. He swims happily most the time and then sleeps upside down after he eats. I am beginning to wonder if he just likes sleeping upside down. When I walk over to the tank and he see's me, he quickly begins to swim normal, Anyone else had this happen? Or any suggestions?