That is an interesting thought... Do we always measure measure up from the plug? Or does encrusting growth downward get to be accounted for... I have a mix of both in my tank. I have one milli where the original frag hasn't grown up at all but it has encrusted significantly and has new growth tips rising out of the encrusted areas...If it counts encrusting, maybe. My acros coat the rocks before they start to branch, these days (probably due to the stupid high flow in my tank)
Matt