Never thought I'd be posting in this section but I have a quick ICH question

[tiger15]

The difference between toxin and medicine is the dosage. Too much dosage, it kills the host. Too little dosage, it is below therapeutic level. Yes, salt often failed Because of the wrong dosage. But even with the right dosage, salt doesn’t work for all fish. The test conducted by the aquaculture study (see chart above) found 100% mortality rate on channel catfish.

Salt works by stopping the transmission and reinfection of ich, and will help strong fish such as cichlid to recover on their own. But weak and sensitive fish such as loaches, mutant hybrid such as EBD and EBA, are doomed before salt can take effect.

With powerful commercial remedy, typically MG based, I don’t see the merit to gamble on old salt and heat remedy.

 

[duanes]

Are there fish ( commonly kept in the aquarium) where a 3ppt salinity would likely pose more of an issue than using a malachite/victoria green proprietary blend?

I believe you are right, that some species would not take salt well, but I don't have experience with any of these species of soft water fish, because the general water composition of the water when I lived in Milwaukee was too mineral rich to keep them in a healthy state, so I always avoided any strictly soft water species.
I would have loved to keep Uaru fernandezypezi, but I believe it would have been an exercise in futility with the composition of my tap water.
I have kept a number of Geophagines, and occasionally had to treat a few with salt, and they took it well.