Nice choice for Cories, they're a bit bigger than Pygmys but they stay small.
The cories won't bother Kyon and I'm pretty he won't bother them as well, they're very good community fish like all if not most Cories out there.
They are generally hardy, better than most Cories that are caught in the wild, since they are easy to breed unlike some fish these guys adapt pretty well.
I would recommend keeping it in a shoal of 5 or more, maybe 6 of them would be a good number, makes them more confident.
And yes, they prefer water with a lot of tannins soaked into it. It makes them feel more at home since the Amazon waters are full of tannins.
As for food, they're omnivores just any good brand for sinking pellets. You can feed them frozen or live food sometimes to supplement.
Also make sure to have sand as your substrate!