Is this scale burn or scale rot??? Help..

Guys,

Can anyone enlighten me what sickness my aro is currently suffering?
Can it be cured with just salt+heater? Any need for other kind of medications??
Please advise.

Thanks!!!

[stoner]

Did you do a huge water change recently?

From the photos... it quite hard to tell... it could be PH burn...

My last water change was only around 20%..

Btw, do can this sickness be passed to another fish?
Since 2 weeks ago, one of the aro in my tank had this problem.. and it was only yesterday that I start to notice that another aro start to have this problem as well (2nd aro).

May I know what can be done to heal them if it were caused by PH burn?

i used melafix for ph burn..

Is burn, either ph or amnonia burn. Just change water add more anti chlorine, salt plus yellow power . Wash all filters.