I have a Whisper filter for a 2-5 gallon tank and it is set on the lowest flow, but I was wondering if this might be too much for my beta (Moses Blah). I'm not sure, but I do believe he is pretty young. I don't want him to have to work too hard and have no rest. Also, his breathing has seemed to increase since put into his new home. Is it too much for him right now? Should I not keep him in a 2 + gallon tank or stay with a bowl for now?