foxface with fin rot

So my foxface has fin rot. I heard you can use medications in reef tanks as long as you bond it with food and direct feed. I need help with what medications work best and what is the best method for direct feeding. The Fin rot is just starting his fins are a darker shade almost brown and are shredded. This is occurring on his pectoral fins only so far. I have only 1 mushroom coral and a anemone so any recommendations with this and the medications. I have and purigen and I am thinking about picking up carbon to soak up anything that leaches into water while direct feeding. Any help is much appreciated thank you.