I noticed last night that my nice male red betta has finrot. I have been to my local pet shop and bought some Myxazin to help treat it. Should i seperate him into a different tank. At the moment the only spare thank i have is a plastic round goldfish tank which i would not be able to put a heater in. Would he be ok in this for a few days if the room temp was kept quite warm in my bedroom or is it better to leave him where he is and treat the whole tank.