I'd say leave them there unless you want to create a zoa garden on your rocks. I've started keeping Acros so don't want them to take over so I moved them down to the sand and they are growing like crazy. I'd say the par in the spot I have them is around 170-210. I have some frags in a shaded area around 100 par and they are growing as well. There is a burn-in period where they just need to be in your tank and get used to the chemistry. I had mine up higher on a rock and they had really good growth, when I move them down is where they really took off. Maybe after a month or so if you don't see growth move it temporarily higher then once you see it take off, if desired, move it back down. If you don't have the ability to stick the plug in a hole in your rock you can grab a chunck or live rock rubble that would sit firm where ever you move it. Mine were on a small rock and they have since overtaken it and grown beyond it.