Sloopie still has discolored circles

[Dressage]

Housing
What size is your tank? 20 gal
What temperature is your tank? 79
Does your tank have a filter? Yes (Aquaclear Biomax)
Does your tank have an air stone or other type of aeration? No, but the filter makes a lot of air bubbles under the surface
Is your tank heated? Yes
What tank mates does your betta fish live with? Zero

Food
What type of food do you feed your betta fish? Aqueon Betta Food (Granular/Pellet) & TopFin Freeze dried bloodworms
How often do you feed your betta fish? 2x per Day (4 pellets per feeding/ bloodworms as a treat)

Maintenance
How often do you perform a water change? 1x week

What percentage of the water do you change when you perform a water change? 25-50%

What type of additives do you add to the water when you perform a water change? API Stresscoat +

Water Parameters:
Have you tested your water? If so, what are the following parameters?

Ammonia: 0 ppm - low range
Nitrite: 0 ppm
Nitrate: 0 ppm
pH: 6.8
Hardness: 25 ppm
Alkalinity: 40 ppm

This is what Sloopie's spots used to look like on Spartacus (thank you to Kartman):


http://www.bettafish.com/attachment....1&d=1312481828

Here is what it looks like now on Sloopie- halos on his head (Pic 2 shows the spots around the mouth):





I put Sloopie in a QT tank a week ago due to his discolored spots. I had originally treated him with API Pimafix (for 3 days) but I saw no improvement...if anything he was more lethargic, so i started aquarium salt/100% water change treatments. He now is energetic and eats well. (Like a piggy if i would let him :) He is back to his old self.

My questions are: Do I need to treat with anything besides AQ salt and water changes? Can anything fungal like this turn into scars on the scales? I should add that Sloopie is a rescue fish that I have had for about 6 months. His fins were pretty frayed :( when I got him, so that isn't a symptom.

Thanks all!