I would call 2 inches rare and extremely large for a white cloud. Average is 1 - 1.5 inches, and I am confident of my ID of the fish in the photos.
They're pretty easy fish to care for but prefer cooler water (68F - 76F) and they are very peaceful, so might want to watch them with all of those danios in the tank. Danios are notorious fin nippers, and white clouds would be very vulnerable to that.
White clouds will school if they have enough of their own species, and the gold white clouds will often school with standard colored white clouds, so if you want a pretty mixture of easy, peaceful fish for a small tank, they're awesome for that.
They eat tropical flake food, brine shrimp, and most other foods that are good for the smaller tropicals, but avoid live black worms. Live black worms tend to cause health issues in white clouds.
I have to run for now, but if you want/need more info on them let me know and I can come back and post more.