Most of what you see Dark brow/purple polyps w/a fluorescent green coenenchyma, (body) are Montipora Spongodes,..an extreamly hearty fast growing, (to the point of becomming a nuisance) coral,
that plates, encrusts,..AND branches.
While true confusa, seems to have a pink axial rim, and plates primarily with some incidental encrusting and sort of "spikes" instead of true branches.
IMO...but I don't have ant true confusa, just TONS of spongodes,
I have it growing on/encrusted too- glass, pumps, frag racks, tank bottoms, tank walls...... I think the dog is next if I'm not careful!!