They normally grow slow but are notorious for doing great and melting overnight. I saw it advise to keep them in more than one place in your tank as a precaution. This was the most expensive zoa frag I ever bought 2 years ago $120. I had the misfortune of watching asterinas eat them. I haven't dared to buy another expensive zoa since.I do not know what’s up with this strain but they grow like crazy. Started with 3 now have 8 since the time of the swap
I thought gmks were slow growers too