They were also from a local breeder weren't they?My guys were 2-3 inches when I got them, they are brothers and sisters and I think the way they react with each other has something to do with that, they are very protective of each other which is really cool.
That makes a huge difference because they are well fed up to the time they get bagged and sent to you. No suppliers, exporters, importers or pet shops in between. Just a direct route from one tank to another with a days travel in between.
And your tank is a decent size and was set up with loads of plants well before the fish arrived. Compare that to most pet shop tanks that are tiny by comparison and either bare bottom with no ornaments, or a thin layer of substrate with a few bits of wood or rock. I know which tank I would prefer to be in. Big and lots of plants.