You will receive one dozen Aeneus GREEN Corydoras, tank-raised, 1.25 but will grow to 2.3".  They prefer a pH of 6.0-7.5 with temps 59-77F.   Each Cory will be individually bagged along with samples of the food they've been eating.  They love Bobs Cory Cookies and Bobs Veggie Flakes.  Strong...Bold...Beautiful!!!  This has been one of my favorites for several years and I'm confident that you will enjoy this fish.