I’ve kept multiple copperband butterflyfish (Chelmon rostratus) in my reef over the yearsMost marine aquarium hobbyists learn quickly to identify common warning signs of ill health in fish—white spots, excessive mucus production, bulging eyes, frayed fins, etc. But sometimes ailing fish exhibit much more subtle symptoms that are evident only to someone with powers of observation honed by many decades of experience. In the following excerpt from his book The Avant-Garde Marine Aquarist: A 60-Year History of Fishkeeping, hobby pioneer Paul “Paul B” Baldassano demonstrates how things with fish aren’t always what they seem:A copperband conundrum Recently, I was in a large LFS in New York. My mother-in-law is in a nursing home nearby, so I go there often. This store is very old, and I even helped start their saltwater tanks in the early 70s. They had a tank of about five copperband butterflies, and they were kind of cheap—like $20.00, which is a great price for copperbands. MORE