Green Star Polyps, are an excellent beginner coral with regards to hardiness however they do come with a slight downside. 

They grow as a matt which can slowly spread across your rockwork if not kept in check. They also have the ability to sting other corals making them a double threat as an invasive coral. 

Controlling them however is relatively easy, as all you need to do is place it on a rock on your sandbed and then the coral will be unable to grow onto the rest of your rockwork. 

Frags of this coral have been growing under LED lights for a while, and they have flourished with both rapid growth and good colouration.  

It is a soft coral with green lashes and a white center. 

Although not advised, this coral can tolerate lower than optimum water quality, lower lighting, however moderate flow is advised to maintain optimum health, the flow is important because it will keep detritus from settling on them 

In addition to this, it will also require the correct levels of Calcium, Alkalinity, and Magnesium along with various other trace elements found in natural seawater.

Additional feeding isn't required to maintain its health, as they get the majority of their food from photosynthesis.

Care Level - Easy

Flow - Moderate,

Lighting - Lower end but can tolerate a wide range of lighting

Temperament - Aggressive 

Frags of this coral are 2 inches 

Due to variations within species, your item may not look identical to the image provided.