NB copper is pretty notorious for killing sea life. It's fine for fish and mammals, but a very small amount can kill all the algae and non-fish critters in an

NB copper is pretty notorious for killing sea life. It's fine for fish and mammals, but a very small amount can kill all the algae and non-fish critters in an aquarium. Old timey copper submarine wires killed life for a fair radius on either side when they broke down. Most sea life just isn't capable of dealing with anything more than trace amounts of copper. When paint flakes or is scraped off the chips could have really negative local effects.