i have a flowerhorn. he is about 3 and a half inches long. does he need a water heater close by. and all he does is swim up like he is about to die. i just got him and i dont know if this is normal or what. he will just sort of sit at the top of the water and look at the lid but doesnt move. what is this???? he isnt eating either not that i know of. i just got him two days ago. what should i do