This is the only acropora that is actually growing in my tank. I have a few others that are just laying dormant. For about 3 months this slimer has been very slowly receding from the base. A few weeks ago I broke the tip off moving some rocks around. It seems the receding has since stopped and the broken tip has healed over. I see new growth all along the main branch. My question is...Will the tissue ever grow back down to encrust into the rock? Or does this need to be fragged so it can encrust? Does it need to encrust in order to thrive?