originally posted by randyO
Acanthastrea lordhowensis grows by encrusting, from what I've experienced. When I cut 2 or 3 polyps off the mother, I glue them onto a new small rock. After a few weeks, the frag starts to encrust the new rock. As it spreads out on this rock it will send out baby polyps in this new growth. After about a month, the frag will have a small ring of baby polyps around the larger 3 polyps. At this time, the full polyps will start to get larger. Another month of encrusting, and those baby polyps start to get larger. The main 3 polyps now start to swell up very large. Also, you should start to see more baby polyps develop as the diameter of the coral increases. The more you feed each polyp, the faster they will grow. By 3 months, your well fed frag should have over a dozen full polyps, with small baby polyps around the perimeter. Eventually, the coral runs out of rock to encrust. Then it's starts to put it's growth energy into the size of the polyps. It will also start to deposit more of it's own skeleton. It will start to grow up, creating a mound look. After about 6-8 months, you end up with a tennis ball size colony.
As for echinata growth, I've noticed my colony healed up after I cut a frag out a couple months ago. I've also noticed a few new smaller polyps around that area. But not much in the way of growth on the rest of the colony. I don't think these grow even close to the pace lordhowensis grow. I do feed mine at night. The mouths are always open. It will also feed during the day when I feed the fish. The mouths will open shortly after adding food to the aquarim.
originally posted by randyO