From what I have gathered, most goni's like higher intensity light. You have to Properly Acclimate them first though, otherwise they will remain retracted for a long period of time. My observations are, if kept under lower intensity light, goni's will look stretched; like xenia under lower light. Many/most will also turn more brownish/ tan colored all over and lose their bright coloration. Instant results with polyp extension under a lower light source doesn't mean that is the ideal lighting for the coral.
I believe that Goniopora will be much easier to keep once the proper methods for overall husbandry are established. JenNKerry are on complete opposite sides of the fence than I am when it comes to "proper" husbandry methods. I mean nothing bad by that. It just shows that goniopora can be kept in a variety of habitats as long as they are acclimated properly and target fed occasionally.