Pat I have not had red sore in any of my ponds. However when I have something happen I start feeding a 50/50 mixture of medicated feed & regular feed. I have had high density populations where I had to be proactive at the first sign of disease. I also have dumped in salt (non iodized safe for consumption) into the water to help out. Salt is basically like giving an aspirin to fish.

Salt In Aquaculture PDF