The seller confirmed it is Hydrolithon gardineri, that it requires similar light to an SPS and that I should be OK not dosing but they dose...well I just copied his reply below.
"Good question. We use Instant Ocean Reef Crystals in our system. Though we dose 8different supplementations, namely: Red Sea Coral Colors A,B,C,D, Brightwell NO2 and PO4, Aquavitro Fuel, Brightwell ALK, because we keep a handful of corals, inverts and macro algae that need these additional supplements and we only do 5% water change every 3months to keep everything in balance.
I don’t think you’ll require dosing if you do regular water changes and keeping a few corals in general."