Here are the facts as I know them.
A friend of mine was having problems with his tank going cloudy,
so he did a 50% water change using Water-ager in the new water.
Everything seemed ok, until he noticed his neons had started to die.
Three before work and on arrival home quite a few more, until only four of the school of twenty were dead.
ALL were egg laden females, and an autopsy showed them to have very red gills.
Water conditions are fine, no ammonia, nitrate, or nitrite.
pH was 7.6.
Water was so good the Pristillas decided to do their thing and spawned all thru the tank.
No sign of Neon Tetra deasease, anyway, that wouldn't knock out that many in such a short time.
SO,
what do you reacon??
Any ideas??
Other than the fact that I think somehow the new water was toxic to the neons, but strange also, that it was the females that died.
Open for discussion.
By the way, he may be in tonight with a friend, so get ready with the buckets of water to chuck over them.
Alan 104