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These grow in spurts from my experience. I've also noticed solo polyps don't always do the best with hallucinations. For some reason when I had a colony they were growing like weeds. Then again, every tank is different!
I have a single polyp on my frag rack and I am pounding it with light. 4" under the water, XR15's at 35%. It popped 2 polyps in less than a month. Not sure if it will help you but high light helped me on this and a few other zoas.
Fragging in general is a destructive process, fragging any coral slows it's growth. Zoas grow at an exponential rate. Each individual zoa may take between 2-8 weeks to grow a single polyp. That means it takes two polyps 2-8 weeks to grow two polyps (one each), which means it takes 16 polpys 2-8 weeks to grow 16 polyps (one each).
The more you have, the more babies you get.
You want a banging colony? Don't ever frag it, ever. Fragging from 5 polyps down to 1 means you just destroyed like 6 months growth, and started over at the beginning.
Does the polynomial growth continue once the colony gets big enough to encompass heads in the middle? i.e. if there is no room in the middle of colony for a new head to grow will a new will still sprout and push the rest outwards?