Since the two are in the same tank, you should be feeding more often as was already said (because of the baby).
As for the fungus, some one else told the truth as well.
Raise the temp to 86. HOWEVER, you need to keep it that high for about two weeks AFTER the last sign of illness..so that means maybe three weeks or even a month. No big deal.
Since you aren't sure if the illness is bacterial or fungal, try a "cocktail" of Melafix and Pimafix used according to the directions.
I would ALSO (on top of the heat, Pima and Mela fix) add 1 tablespoon (3 teaspoons) of aquarium salt per 5 gallons of water. That will boost osmotic gill function for both of your O's.
In future, my humble advice is: PLEASE QT new fish for at least two weeks....even if you QT them in a Rubbermaid container on your kitchen table...
It saves sooooooo much grief!