I would skip the pearl gouramis. The tank is already at its basic capacity with the stock you have.
Gouramis, and other labyrinth fish are often shy at first. Plus I would think they aren't a fan of the danios.
Lots of plants is key for gouramis.
Keep it natural.
They don't seem to mind the danios. They only hide when we are in the room, otherwise they swim freely in the tank. I've been hanging out quietly by the tank around feeding times and they'll now come out and watch me at other times as well but I'm not allowed to move. It's been a week and time is definitely our friend. I'm going to add more plants, I'm looking for some nice tall ones that will float to give some surface cover as well.
These fish will learn to love me darn it!