AAAhhhhh another of my neons - well the last one, has succumbed to this odd disease. This fella looks exactly like the very first one - the very front part of his lower jaw seems to have dropped, sort of like sticking out a bit. Only very slightly at first but it seems to get worse. The very first sign has been a slight then increasing loss of the red stripe - from the tail end. He seems OK otherwise - but for all the others it was eventually fatal (mind you they didnt all have the jaw dropping business). I can't see any fungus nor have they ever shown anything that would indicate they have a fungus in the mouth region. All parameters are fine. Anyone got any ideas??