You could try a treatment plan that would be geared for treating ich, but would treat fungus some without even stressing the fish with harsh meds.
- Start with a 50%
water change and clean the substrate. Slowly raise the tank water temp to 83-84F.
- Look for a product called Rid-Fungus (or Ick-Attack if you can't get Rid-Fungus).. Add a capful of that daily to the tank.
- Do daily water changes of 25%. If possible, make the new water close to the tank water temp.
- Clean the substrate at least once a week.
If you can find them or have them, add 1 drop per gallon daily of: Garlic Guard, Vita-Chem and Fish Protector. Also use Prime to treat all water.