I have an established tank (5 years old) that I switched over from mbuna to all male peacocks. Bought 7 peacocks (approx. 2 inches) about two months ago to join the four 5-year old syno cats that I kept after rehoming all the mbunas. They were doing great, eating well, getting along and really coloring up nicely. Then my local fish store (that I have bought other things from all the time) had a big sale about two weeks ago and I bought 4 more males (about the same size). Everything was fine until this weekend. After a regular weekly water change, came home to 5 floaters. All water parameters are fine. Some of the fish had reddish gills. What do I do now????? HELP.