[White discoloration on guppy]

Thanks for the info. I'm setting up a quarantine/hospital tank so I can treat it 

[White discoloration on guppy]

I'm new to aquariums and new to this forum and let me just say how hard it is to get clear pictures of fish that won't hold still. I think I now have 40 blurry pictures of this fish.

OK, this guppy just started showing some irregular white discoloration yesterday and it seems to be getting worse. I can't tell if it's something growing on the scales or not but you can judge from the pictures. Any help would be appreciated. 

Nitrate - 0-20
Nitrite - 0
Hardness - 300+
Chlorine - 0
Alkalinity - 180
Ph - ~7.2
Temperature - 76