I guess I don't do anything special for it. Treat it like a colony of zoas? Mid light, med flow, good parameters, leave it alone. I hear all the time people have troubles with theirs, but I've kept white and red gonipora with no problems...
I have had trouble with my green goni, until I started feeding it diectly with a cut bottle and rotis, and reef chilie etc. +1 to above med light, med flow, of course params.