I agree! I have 7 right now. They stay in a tight formation and look great in a large tank. The only way I have killed them is panic jumping and or swimming into the sides of the tank. I pretty much quit gravel vacuuming because of this. They love Brussels sprouts and other greens. I drop in while still frozen, they seem to sink and are easier for the fish to eat because they are softer when they thaw out. Very easy to keep. My oldest three are 5 years old now.