Hi,
That's a nice looking fish, apart from the patch on it's head

.
I had a similar patch on the head of one of my
soon after I purchased one, I thought it was heater burn, from hiding behind the heater.
For now I would keep the water clean through regular water changes, the 0-0.5ppm Ammonia concerns me, it could be enough to cause the fish to become stressed and make the condition worse. So I would do a water change right away to get that down, then keep checking as regularly as you can, in case it gets worse, then hopefully we can make further suggestions.
I noticed you have a substrate for plants, is that new, could it be releasing some ammonia?
How long will you be away for over Thanksgiving?
Good luck.