when you say "turned white"
did the body turn white
or was there a white growth on the body? No growth - just a white bottom lip and white belly.
are all the other fish healthy? Yes
any new fish added inside the past month? No
tank size - 55g
temp - 75
tank mates - 2 elongatus, 2 yellow labs, 2 joh chismulu, 1 borleyi, 1 texas, 2 lemon jakes, 2 taiwan reef, 2 iceburg ahli, 1 OB zebra, 1 polit, 2 permutt
water chemistry (pH, ammonia, etc.) of tank water and source - all chemistry perfect, Framingham tap, aged overnight with cichlid salt, dechorinator, and buffer
filtration - AquaClear 110
water change schedule - 10g every 1.5-2 weeks
chemicals you add - just whats listed during water changes above
diet - Ned Flakes and Veggie flakes
potential accidental poisonings - none
anything else you can think of - nothing else