UPDATE: The ammonia level was tested again today, since the recent water change, and it was seemingly the same as before - on the color chart it seemed between the yellow (0ppm) and the light green (0.25ppm). I would think the water change would fix this, along with the new filters, so I am wondering if I am being too paranoid and it is simply 0ppm but my eye isn't seeing it correctly. With that said, I am not trying to make an excuse and want the best for him.

I was going to Petsmart to pick up API ammo-lock and ammo-carb, but was advised by a friend who worked there to just change the water out, which I did. I did get new ornaments today (a ruined castle ornament with plenty of hiding spots and a leafy nat-geo ornament) and they take up most of the tank without taking away all of the area. I also did get a thermometer, and the water was at about 64 degrees F. I also bought the Aqueon 10W Heater and since having it in for about 3 hours, it is up to 70 degrees. The heater adjusts the water to 78 degrees and has an auto off. I fed them again today, placing the sick one (Jasper) onto the food before leaving to get some groceries. Upon coming back, he was now facing forward off of the food with his mouth open. I moved him gently back onto the food to be safe. He is still not moving (almost at all). I am wondering (perhaps from paranoia or from being science-inclined) if the water might be moving him, or if in the process of moving him I am just touching him in certain ways that cause his muscles to react. I am also curious to know if Ichabod (the healthy ADF) might have gone and eaten the food and just moved him. The last thing I want is to leave the dead frog in the tank if he is, or to take him out altogether if he is not dead. I unfortunately cannot separate him from the tank, because I do not have another tank and we are currently amidst a blizzard. The most I could do unfortunately is put him in a cup or tupperware, which if you advise I will do.

Just tested the pH as well - between 7.0 and 7.4 according to the master test kit from API. I did read elsewhere in multiple locations online that the pH is okay there. I understand though that the water changes occurring that infrequently can cause pH changes. Note though that since the new tank, which was obviously setup with brand new water, this was the first water change and it has only been about a month since the tank was setup.

UPDATE 2: I did go out while the snow was light and purchased a $4.97 0.5 gallon tank from Walmart that's normally for beta fish. I bought some blue gravel and put it along the bottom (not too thick of a layer, since it's only a 0.5gal tank and I know they normally should have 2 gallons per frog, but I wasn't ready to spend that much and set up a whole other tank for an isolation tank). I filled it as much as I could for him (not quite all the way to the top where it's about to spill over). I made sure I rinsed the tank first, then added the Great Value bottled water. Then I added the ~1/2 cap of Stability by SeaChem. When I netted out Jasper and added him into the new tank, I noticed some (L) arm movement, but am wondering if this could have just been the water motion. Otherwise, no motion. Please advise if I am doing anything wrong or you have any more suggestions! Thank you again for all your help!