I see that many corals are grown on small white discs. Can the corals be transferred from the discs to live rock base? Or does one attach the discs to live rock?
That is up to you. You can take the plugs and try to get them to stay jammed in rocks, i find that my crabs and snails knock them over. You can remove them from the plug carefully need some tools, and then glue them directly to the rock with gel super glue.
Or simply glue the plug with the coral on it to your rock. I use IC Gel... If your going to the Frag Swap this coming December, I am pretty certain that Josh will have some for sale.