White Blotch On Pearl Gourami

I just got home from work and noticed a rather large white mark on my young pearl gourami. It was definitely not there last evening when I was feeding them.

It does not look fuzzy like fungus. It almost looks like the scales are missing. Would the fishes skin be white if the scales indeed were missing?

I've attached pictures.

In the tank is:
4 female pearl gourami
1 male dwarf gourami
5 male turquoise rainbow fish
6 highfin skirt tetras
3 blood parrot cichlid
5 kuhlI loaches
1 bristlenose pleco
3 otos

Parameters are 0 ammonia 0 nitrites and 30 nitrates (doing a water change tonight)

The only thing that has changed recently was that I moved houses and the tank is now on RO water, but it has been for a little over a week, and this just suddenly appeared over night

 

Giving this a bump up for you hope you get some responses today

 

Could it be Saddleback disease?

That's all I can think of.

I've had a Pearl Gourami jump and hit my lights, removed some scales. Underneath was a very matt grey - not white at all.

 

I just googled it and you may be right, but I wish you weren't.

I will go today to get meds. Do you know of any commercially available brands that are available? I'd like to start treatment asap rather than wait for something to ship to me

 

Disregard my previous post, just checked out the stickied post on columnaris. I will pick something up tonight

 

Looks.more.like a fungussed wound