How will I stop this from spreading. It was my son's and wouldn't grow in his tank so I kept moving it to mine and then once it recovered he would try again with the same results. This time we left it in my tank and I did not foresee the rapid growth. It's attached itself to some of my main rock work and now I see two branches of it on opposite ends of the tank. I assume it let's go and floats until it lands somewhere. Either way I am a little afraid it will take over my tank.
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It likes phosphates. When dropping them below 0.05ppm to favor stoney corals, the colonies can crash. You can use a few other coral species to hold it in check. GSP will stop its advance.