Jack Dempsey odd coloration

[randomguy1191]

Hey everyone. I was on vacation for ~2 weeks so my 75 gallon went uncleaned, but I did have someone feed the tank every other day. Nitrates were around 80ppm when I got back and now they're at 30 ppm. After the two water changes, my Jack Dempsey has some odd coloration. He's become very pale on one side of his body with a black area on the same side but near the head. The other side seems fine. The other fish seem fine as well. It's been 2 days that he's been this. Is this something to be worried about? Pics Included.

The rest of the parameters are
0ppm Ammonia and Nitrites
76 degreess
7.8 ph (tap water has high ph)

Thank you!

 

[Brookster123]

Could be ammonia burn?? I'd just get those nitrates as low as possible and keep them there. Good food and clean water go a long way.

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