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Hi. I know what to do for the fungus, just trying to figure out why he would get that? He's been fine in a half gallon betta tank. I changed his water and put him in a 2 gal with a heater since it's been colder. He didn't seem to like the bigger space, so I took some water out and he swam around more. Now today has fungus on his head. Guess I'll treat and if he doesn't get happy again, I'll put him back in his little tank.
