Yup Psycho, I thought they might be. They grow very fast as do all Star polyps IMO, but they dont sting everything like my GSP.
Smithers, Star Polyps are a fast growing encrusting coral and when GSP's come up against other corals they try to grow over them. GSP's have a sting and will kill off acro polyps before they grow over the skeleton.
I got the same stuff - got it from afsal, I put it in the back corner and it has started to creep along the back wall, also got 2 rocks from mango and they have both started to grow along the bottom (tank is BB) - is thei a wise idea?
Not even I can kill these things. I have found they like to grow towards the light and have very little growth downwards. I have mine growing on my back and side glass. With a little on the rocks. Will be getting rid of the rocks though when I upgrade my tank. They do pack quite a sting.