Kudos to your academic credentials that allow you more access to scientific publications.That isn't research, that's just an article by Dr. Francis-Floyd. It carries no more weight that my fish disease book does. She doesn't have a strong connection with the home aquarium hobby. She likely has never used an amine-based copper product to treat fish.
Jay
Why is the article used by both Florida & Texas Corporate Extension Services. I can assure you, that investors would consider those agencies as reputable sources.