If the tank was running that long and the only change you did was add a new fish then there is a pretty good chance that the fish was carrying something. Did you QT the tang before adding it to the system? After adding the tang did it seem like bit by bit the other fish were acting a little less lively. How often do you do a water change, and did you increase feedings in order to get the new tang eating? I once did a water change with a new sponge that was supposed to have no chemicals in it and the next day all my fishes were floating. I ended up getting a hold of the company that made the sponges and they said it is possible that the batch before may have had anti bacterial applied to it and that traces of the substance could have got on to my sponge, but of course they were not responsible. Good luck solving the mystery, and sorry to hear about your loss.
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RSM 250. Clownfish, Fox face, Blue tang, Yellow tang, Kole tang, Clown tang, Coral beauty angel, French Angel, splendid dottyback. CUC, softies, lps, sps.
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