Stop using the ph conditioner. Fish are more than able to adjust to a variety of ph levels. Those conditioners often do more harm than good. Also look into getting a quality liquid test kit, like the API master test kit. The strips are more than often incorrect in the results they produce.
Did you cycle the tank properly? What is your water change schedule like? If you could test all the parameters in your tank that would be good, at the very least ammonia, nitrate and nitrite. An ammonia reading of "pretty good" is often more than enough to kill fish.
Neons are very sensitive to bad water conditions.
PS, I like fern gully too:headbang2:, also this was my 1111 post =-0
