He looks alright to me, not sure if anyone else can see any abnormalities. I wouldn't jump right to NTD right away, from what I've read (and a NTD scare myself) usually you expect to see some deformities in the fish, mainly weird bumps and/or discoloration.
Some basic questions that may help us help you (help your fish):
what size is the tank?
how many fish (neons or not) do you have in the tank?
approximately how long has the tank been set up?
How often do you do water changes?
How are your water parameters?
Weird behaviour like you mentioned I've seen when I was medicating for ick without an airstone when I was a bit more naive, causing the fish to be deprived of oxygen. When they weren't at the surface gasping for air, they were swimming oddly and resting tilted at an angle.
Not sure if that sounds like it may be what your situation might be, but increasing my HOB filter flow and adding bubbles helped them a lot.
