need more info....
tank size : 55 gallon
tank mates (species list) : 1 blue johanni, 1 yellow lab, 1 kenyi, 2 red zebras, 2 snow white zebras, 1 6+" sydonontis and a pleco
recently added fish and source of fish : all the cichlids are from petco and were added over 2 weeks ago.
pH : 8.2
filter system: 2 Penguin Bio-wheel 200's
type of DEAD fish : Blue johanni
type of well fish: all the other show no signs of any distress
water change schedule : 10 gallons or so every week
...possible chemical poisoning : ???
anything you can think of: the johanni did have swollen gill plates and they were very red.
any help would be great.