The Rummy-Nose Tetra gets its name from the red color of their snouts. This red stain only comes to full color when the fish is in top shape. Officially, there are 2 very similar species, one called "Rummy-Nose" (Hemigrammus rhodostomus) and one called "False Rummy-Nose" (Petitella georgiae). They say the main difference is exactly in the size and shape of the red, but I have trouble distinguishing them. This small tetra isn't as hardy as most others and is sometimes very shy, but if it's feeling healthy and secure it's a great school fish to have in a tank.