Green star polyps are a wonderful coral to start with if it is your first coral. They grow quick, so if you don’t want it all over the tank maybe isolate it on a rock or structure island.
Green star polyps, reccomend keeping them away from any rock you like in your tank...lol. Give them their own island as they will over grow any and everything in a matter of months.
As everyone is saying above, definitely keep it isolated from the main rock work. It grows insanely fast— I keep mine in moderate-low light and high flow.