I recently noticed a lesion on my Salvini Cichlids head. At first I thought it was just an injury from fighting but after a little research, I'm worried it may be the beginning of Hole in the Head (HITH). The fish still readily takes food and is behaving normally. The damage seemed to show up overnight and I don't think HITH would show up that fast, would it? Water parameters are all fine and all other fish show no signs of illness. Any thoughts?
And sorry for the poor picture, it was though to get one of him still.

And sorry for the poor picture, it was though to get one of him still.

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