I have had this male Beta Fish for almost a year. Actually, he belongs to my son. We've kept him in a small beta bowl until "Santa" brought him a new 2 gallon filter tank for Christmas. He seemed quite happy in his new, larger home until a few days ago. He started sitting on the bottom & not eating. I thought that the filter was pushing the food to the bottom before he could eat it so I put him back in the small bowl with fresh water and fed him. He still won't eat. I even gave him a bloodworm which he ignored. He seems more active than he was in the larger tank. His fins are displayed & he's not sitting on the bottom. Why won't he eat? Are we going to lose our finned friend soon?