I've been admiring this thread on the sps forum for a while. Amazing stuff. I've noticed that many europeans seem to prefer the open top and shy away from canopies. I wonder if its for other than aesthetic value. I do like the look. Some of those tanks are so crowded with sps that I wonder how much room the fish have to swim, especialy the tank with the Clown, Naso and Achilles Tan. The europeans have been in this game for a bit longer than us, and some of their tanks may simply be more mature. I don't believe there are any tricks to producing large corals. Just time, patience and good husbandry. I presently have a blue tenuis that started as a one inch frag about two years ago. No special feeding or additives. Now it is the size of a large cantalope. And thats with continual fragging. I've had to start the painful process of selling off some nice colonies, to allow others to grow and mature. Eventually I'll be left with a few large colonies. I guess its all part of the evolution of the hobby. Before long, more of out tanks will have that more natural reef appearance.