I talked to a guy at my LFS recently about Roseline sharks (Puntius Denisonii). He told me that Roseline's are very sensitive to water changes and that you shouldn't change more than 10% of the tank water at one time. I did not find any information verifying this on the internet (though quite a few fish owners do lose their Roselines).
Does anybody with any experience with these fish know the real issue here and what can be done about it? I know Roselines need high O2 content in the water.
This LFS is quite knowlegible in most areas, so I wanted to research this some more.