Eileen,
The one with the dark face... one side only.. that should pass..you mentioned the fish are skittish.. "blackened "areas like that are what often happens when a fish crashes into something.
Somethings definetly making them skittish. From your last thread you mentioned that they were skittishIf you are working alot and slacking on the wcs ( which means you probably aren't in there as much)..That may help explain the skittishness.. It may have to do with the tank position, room traffic or lack thereof and lighting...They still r skittish a bit because they r in a diff rm but i do visit as much as possible. I am gonna try to do more w/c's and then on the weekend, clean the tank. The tank does get pretty funky tho...
Healthwise...they have no sign of disease...no off colored feces , nothing but stress and appetite changes.. Usually these things come from tank conditions, water quality, lighting and tank position.
Are the challenger fish in the same room as the two other tanks that you are comparing them to?
-al