Just because you don't see the symptoms does not mean it to be gone. Follow the direction on the box to the letter. Don't take short-cuts or stop early. Run a full treatment to be sure of fish being free from the bacterial infection. Also maintain steady temps in the tank.
I shall, once I get the medicine. Hey, anyone know how much the medicine will cost?
For Maracyn I and II, enough to treat them all in a 10 or 20G? About $20 after tax most places. $9 or so a box.