[boozerell]

Thanks for the information. I have an eel in a tank that I want to go fallow, to rid it of ich. I'd rather not remove the eel, but know I probably have to. So I was trying to become better educated on resistance and the carrier aspects of ich. I can see how substrate can act as a carrier. I think with the fish component it gets tricky, especially if ich is attacking the gills where it is less visible.