Button Polyps (Neon Green Center)
Button polyps are hardy, can spread relatively quickly and are generally fun to keep. Moderate turbulent flow to stronger turbulent flow will be fine for these guys. They tend to become more compact under heavier flow, and spread out more under lower flow.
A very hardy species, Their leathery texture and larger size allow for easy fragging when you are ready. This listing is for 10+ polyps, while the frag you get won't be exactly the one in the picture, the polyps should be pretty similar or have more green coverage.