My Betta has been sick lately. At the beginning I thought it was fun for but now I think it is a fungus infection. This is my first Betta I have had since a child and I’m not really sure what to do to help him. He is in a 1 gallon tank with a heater. I know, I should have him in a bigger tank.. etc. but I just need to know how to help him get better. I have been using a anti fungus tablet in his water and changing it regularly. Help please! It is greatly appreciated!