Plant growth in saltwater aquarium

[jmillerfla]

I have had this growing from my live rock for several months. I continue to pick it off but it grows back. Is it a good plant or bad plant?

I have attached photos

thanks

https://www.facebook.com/photo.php?...004211473.1073741827.587061472&type=1&theater

 

[Green_fishy]

Good, it's Halimeda opuntia, calcerous algae

 

[jmillerfla]

Thank you. I searched pictures and found it .