hello black angel
the med is for common diseases such as white spot, fin rot, fish fungus and wounds(straight off the bottle).
they do look like they have had a dusting as you said! the water changes seem to be helping and they seem alot livelier and are still feeding. they are in a 25ltr tank on thier own and when i change the water i use a gravel vacum as well! i have no heater in the tank and the filter is a built in one in the hood with no carbon in it.
i will try the salt bath as i have a box of aquarium salt handy and i will continue with a 50% daily water change and re-med the new water as i add it!
thanks for the info
nath1