I purchased five green chromis from the LFS and acclimated them the way I always do. They were all eating well, but overnight one developed a scar on the right side of his body. The next day he was dead. I did not see any confromtations with any other fish, but for the next week, one by one, they all developed the same thing and eventually died. Any clues???? The picture is not great but it looks like the scales and skin are just deteriorating all on the right side of their body. Water parameters are all good.