Hard to tell from the pics- are the white marks indented at all? Is it the scales that have turned white, or does it look like the white marks are small "pits"? Still looks like HITH to me. Crenicichla tend to prefer soft water, and pH that is below 6. Nitrates at 40 are also a little high- not too too bad, but around 20 would be better. I always say that stable conditions are better than optimal conditions, but crenicichla are known to get HITH in higher-pH, harder water, and water with higher nitrate or other levels. I'd up your water change schedule a bit and try to keep nitrates lower and see if that stops it. Unfortunately HITH scars never really go away, but if the conditions aren't corrected it can worsen as time goes on.