My yellow star polyps have disappeared. I bought this rock for $10. It seemed that the individual polyps vanished one by one. I tried placing the rock in two different places. The first was in a somewhat shaded area in the tank about half way down. They didn't do well there so I moved them to full light at the top tank. It didn't seem to make a difference. They still kept disappearing one by one.
Earlier this week I was down to the last one. Today, even that one is gone. There is no evidence that it was ever there. It is almost as if it just decided to let go with its foot and let the current take it somewhere else. Maybe I'll spot one again someplace.