Welcome to the community!
Just like you I planned (and added) a single albino cory to my tank. Quickly after, I discovered it'd mostly sit still and not move much. I rehomed it to the corydora tank at my LFS and now everytime I visit I see that albino cory super happy and active. This goes out to show that corydoras are all shoaling fish and love company of their own kind. Like Pepere said above, I'd suggest you to get more albino corys. Unlike some species, corys don't really stress each other out so the male:female ratio shouldn't matter, and you should be fine picking up a random bunch of albino corys from the shop.
36g is pretty large so it increases your options significantly. You should get more glo tetras to form a school of 6 minimum. Of course the more the merrier. For centerpiece fish, try some kind of rams (if you want more than one centerpiece fish), or just a single Angelfish for the very reason Pepere stated above. You could look into some kind of cichlids too. Of course make sure to read the care guide for each species before getting them.
Good luck!