Sounds like an asterina star.
You will hear mixed reviews but generally speaking the white ones are pretty much a safe bet. They multiply by dividing. If you have a seven armed one that is 1/2" you will probably soon have one three armed and one four armed half-starfish. Typical and very common live rock hitchikers. If they get too many you can pick em out by hand.
You will hear mixed reviews but generally speaking the white ones are pretty much a safe bet. They multiply by dividing. If you have a seven armed one that is 1/2" you will probably soon have one three armed and one four armed half-starfish. Typical and very common live rock hitchikers. If they get too many you can pick em out by hand.