The fish did die eventually, I did remove him from the 120 and put him in my hospital tank with no luck.
The water you guys think is bad is actually just my camera, the water looks flawless in person.
I checked all my parameters and everything is normal. All of the other fish in the tank are absolutely fine.
If you read my other thread in the cichlid forum, there is a more detailed information. but in short, all those fish were moved yesturday, so im guessing it was the stress that killed him.
Thanks for your replies.