If it's bacterial you will also see some discoloration, it will have a clear appearance. In that case you would need to do a few extra water changes with well aged SW
and add a good marine vitamin to the water daily for a week. Make sure it's high in Vitamin C. Be sure to reduce the skimmer flow and remove any carbon/resins. It may just simpley be irritated
If it's excess slime, usually caused by irritation then it could be getting to much water flow or it's simpley a feeding response if it happens soon after adding foods to the tank.