This actually explains it well-
Charcoal until its all gone sorry for the late response how is the tank doing MetalRavioli
FA165/FA165: Use of Copper in Marine Aquaculture and Aquarium Systems
FA165 discusses the use of “bluestone” or “blue copperas” copper sulfate — basic copper chemistry, chelated copper, toxicity to target and non-target organisms, determining dose, reaching and maintaining desired concentrations, and removing copper from the system. Includes references.
edis.ifas.ufl.edu
Charcoal until its all gone sorry for the late response how is the tank doing MetalRavioli