Hello All. I need help. I have a male (I think) Betta who was left with me over the summer. The person he belonged to has not come to pick him up so I think I officially have inherited him. Since I've had him his nose and around his mouth appears white and crusty. There also appears to be a bit of a gash next to his mouth. The crustiness stayed the same for the entire summer but recently has seemed to spread. It doesn't appear like a cotton ball so I didn't think it was columnaris. Can anyone look at the picture I've included and give some suggestions? This is the best I could do, he doesn't seem to like me very much Hes currently by himself in a 1.5 gallon tank and the water with AquaSafe gets a 25% change every week. I don't have a test kit to test the water. Before I recieved him in June I dont think his water had ever been changed. Also he doesn't currently have a heater but when I upgrade him next week to a 5 gallon tank he will.