Originally posted by promethean_sprk
angels are supposed to be very resistant to ich, more likely you have some kind of fungus on them, in which case you should up your temp, put in some stress coat and increase the water quality with changes and filtration. I had this problem when I dropped the temp from 80 to 76 in one day.
I have used a single 1/2 dose of malachite green without anything bad happening to the plants. (hornwort kinda suffered I think) The whole ich regimen might do them in though. Might be better off to remove the fish to a bare bottom hospital tank for a few weeks if it really is ich.