I've always referred to them as polyps, because that's what they are and I would never refer to them as heads. And yes, I totally agree with Jake in that regard. I started in this hobby when only books were the source of information, not the interwebs. So the information was vetted by scientists, etc. Heads constitute many polyps or a certain size. It's basic coral anatomy, which most hobbyist should know or want to know. Jake was a champion of correct information and that's something I can totally get behind. I'm not trying to be a jerk about it, but we as hobbyists should know what we're talking about.