I recently recieved a betta as a gift. It was in a 10g tank with several neon tetra's. It was kept in the basement so I wouln't see it. The light was never left on. The tank has a filter that worked sometimes, and the temperature I don’t think was as warm as it should have been. Apparently the guy in the fish store said that betta’s need to be fed twice a day. Should it only be once? There was food floating on the top of the tank all day so either he’s not eating or was fed too much. He was kind of wilted looking in the corner of the tank. I moved him to a 5g tank a day later and left the tetras in the 10g tank. Now that he is in the 5g tank he is very active! However when I come up to the tank he flares out his gills right under his mouth, like a collar a clown would have…why is he doing this? He only did it a bit is this like a defence mechanism or something? And do you think he will be all right in the 5g? Should I put a plant or something in there? All he has are little rocks at the bottom. Should I put a few of my tetras with him?