PitLuvs- you should experiment and see about using bottled water or something, that's so odd!
I wanted to chime in on the water conditioner... My tap water doesn't have any chlorine in it (I treat it anyways) so maybe their water is the same way??
There's hundreds of fish that die constantly from improper care, there's just the rare few that live on. It's just a very strange mystery. Just like some on here do things perfectly and their fish still pass quickly, which is heart breaking. Just one of those things in life. Hopefully they learn their lesson, though!
Kaida- CT Female 2.5 Gal.
Julep- HMPK Male 2.5 Gal.
Fandango-HM Male 10 Gal.