im not 100% on this,
but they really look like our local polyps (when closed), if so - they dig medium flow and medium light. see if that helps.
Our local polyps have a sandpapery texture to them, do yours?
not sure on the green stuff,hard to make out, does it look more like coral or sponge?
WRT the sponge, they shouldnt really be exposed to air at all - so keep an eye on it. If it seems like its starting to die off, take it out immediately and run some carbon.