About 1 week they had access to minnows but didn't eat which is pretty rare they arnt gorgers they would eat what they want which was usually 3-5 minnows a day each. Sometimes they wouldn't eat for a day or two but then would attack them excitedly. as u can see in my avatar they got really excited about the goldfish which I kno are a poor feeder choice I only gave them once a month maybe. He had about 6, 3-6 inch comets in his mouth
If one had parasites in the tank all do just because it is not showing in the other fish does not mean they are not infected they could be healthier therefore their immune system could just be stronger ....