intern, the only times i have had bn's turn pale is dueto worm infestation. try avitrol plus (its a bird wormer). I find it best to dose 2-3 fish at a time in a seperate tank. I am currently trying panacur which seems to work ok. Read this
Good luck mate. Its been a while since I went through the same issue
Good luck mate. Its been a while since I went through the same issue