Hole in Head disease in Angelfish?

[Plutoids Mom]

I just spotted divots today on my angelfish. They are only on one side of it's head, right behind it's eye. Is this Hole in the Head disease? It is eating and behaving normally.

[Colu]

It could be the start of hole in the head disease I would monitor for now and increase water changes  if it get worse then I would treat the recommended treatment is praziquantel that the active ingredient in paracleanse and API general cure

[Plutoids Mom]

@ColuGiven the other problems (lost all of my barbs a few months ago) I've had with this tank, would you possibly suspect mycobacterium as an underlying cause? I had to pull out my female gourami last week to treat fin rot, which she's healing. Just wondering if I should get a UV sterilizer in the near future. All test readings are still 0 ammonia, 0 nitrite, and 10 nitrate, with 25% weekly water changes.

[Colu]

UV steriliser break the DNA chain of bacterial stoping them from reproducing lowering the bacterial count in your tank they can  degrade micro  fertilizer causeing them to precipitate out and becoming unavailable for plants to use if you are going to use a UV steriliser remember to turn it off when treating with meds

[TankofFish]

I treated my Green Terror that had haole in the head with seachem metroplex, seachem focus, and Vita-chem mixed together with his food. The mixture worked very well and all sighs of HITH was gone in a few days..