White mucus /growth on the fins (between the rays)

[WARCRAFT]

Hi guys,
Few weeks back I saw this white growth/mucus like small patches in-between rays of my recently purchased Arowanas tail fin and now it's bit spreaded. Any idea what this could be and how to treat this? It doesn't look like ich.

 

[kno4te]

Hard to make out in the pics. Add some salt and cont water changes. Could be fungus. Can dab with some hydrogen peroxide on a qtip to the affected areas for now.

 

[WARCRAFT]

Hard to make out in the pics. Add some salt and cont water changes. Could be fungus. Can dab with some hydrogen peroxide on a qtip to the affected areas for now.

Tried to take a clear picture but he's moving all the time when I try to snap . It's growing in-between the rays of the tail fin and in the anal fin, could it be a bacterial infection?

 

[kno4te]

Tried to take a clear picture but he's moving all the time when I try to snap . It's growing in-between the rays of the tail fin and in the anal fin, could it be a bacterial infection?

Hard to tell. Sounds almost like fungus from what you describe. I’d try out the hydrogen peroxide and see how it goes. If not better then give a trial of some triple sulfa.