Black Molly With White Patches

Tank size: 55 Gallon, U.S.
pH: 8.0
ammonia: 0
nitrite:0
nitrate: 20-40
kH: 240
gH:180
tank temp: 77

Fish Symptoms (include full description including lesion, color, location, fish behavior): Fish is behaving regularly, swimming around tank and eating like normal. However, I noticed some white patches throughout body and it's scales near gills look like they're peeling back. White patches somewhat resemble ich, but are more irregularly shaped, larger, and somewhat fuzzy looking.

Volume and Frequency of water changes:15 gallon change weekly

Chemical Additives or Media in your tank: Stress Coat, Nutrifin Cycle

Tank inhabitants:
5.5" Marble Gar
2.5" Peacock Bass
4" Eclipse Catfish
4" Bluegill
5" Common Pleco
2.5" Black Molly

Recent additions to your tank (living or decoration): Marble Gar added 2 weeks ago.

Exposure to chemicals: None Known

I know they're not good pictures, but they're the best I can get.

Need advice, bump.

Yeah.. the pics are kind of blurry. It may be the start of ich. ??

I had a pair of mollies who had this, which i thought was whitespot. It turned out that after 6m of treating them, it just wasnt budging, and i ended up putting them to sleep. Seems it was columnaris If you havent already, separate them.

I've had this problem with mollies in the past, atleast it looked the same. This was a very long time ago. The explanation I got from my lfs was that they keep their mollies in brackish water and I was trying to keep them in freshwater. I don't know if that was the real reason or not, but when I started keeping them in brackish water, they did much better for me.

Mollies are true brackish fish, try making a 10 gallon tank into brackish and keeping in there.