Pygmy cory not doing so well...

blackwater

Have a 15-gallon Fluval; the nitrates are 5, and the ammonia and nitrite are 0. I've been having a weird problem where 2 of my pygmy corys have developed pale bodies and a distinct marking on the head. I already lost one because it wouldn't eat and died from lack of food. This one is lethargic, hangs out near the surface a bit too much, and is pale. I don't want him to end up like the other one. Please help. I will answer any questions. Photos:
IMG-0373.jpg
Stayed in water lettuce for about 1 hour.

IMG-0374.jpg
The sick pale cory
IMG-0375.jpg
Healthy cory on right for comparison.

Sorry for the bad quality photos.
Also just did a 30 percent wc
 

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