is this Hole in the Head?

[Adler]

https://imgur.com/a/K0JEHWM

https://imgur.com/a/eryKmTE

https://imgur.com/a/SBU6lKp

fish has like a bruise or lump on the head.
it's hard to take a video or photo because he won't stand still

Behavior and appetite are normal, he is pretty active.

Ph 8, Ammonia and nitrite 0, Nitrates 40, KH 3°

 

[Pinkey]

I would guess you don't have to worry about hole in the head. It is usually on cichlids and it's usually some pretty ugly deep white holes. Google a couple images and you won't forget it even if you want to.

 

[Adler]

I would guess you don't have to worry about hole in the head. It is usually on cichlids and it's usually some pretty ugly deep white holes. Google a couple images and you won't forget it even if you want to.

I did search on it but google images always shows the worst things imaginable.

anyway what could be it? I'm wondering if Thrive fertilizer has something to do with it, since I started using I've been getting hair algae and green spot algae and now my fish also has this on its head.

something else, I noticed that the area affected is the same that is slightly above surface when he rests during night.

 

[BigDog]

I would stop using the Thrive fertilizer and see how things go from there