You don't need an NPT but you do need live plants and hides. Cories need sand substrate, too. But the most important thing, IMO, is to have the tank cycled before adding the Cories. I love them; they're my favorites and Lil is right, they are so cute.
My Betta tank includes male Endler and Pygmy Cories which are cheaper and a bit smaller that Hasbrosus. My source sells the Pygmy Cories for $2.00 each and the Hasbrosus for $3.50; I'm getting some Hasbrosus next week which will bring my Cory count up to 20.
And I love my Endlers, too. Faye is right, they are great.
Check your water parameters before deciding on tank mates. Neons prefer soft and Endlers prefer hard. My dkh is 10 and pH is 8 which is why I passed on Neons.
Google Nano and Micro fish for a list of compatibles. And have fun!!!