Personally, if I were doing it, I'd cut horizontally right across the center and peel off the top half (they'll grow back), then cut that strip into about three pieces. Glue them onto small rocks, put them back into the tank down on the sand bed to let them heal for a couple/few weeks, and then either list them on craigslist for a few $$ or find a lfs
to do some horse trading. That's what coral fragging is all about..... I'm in a local club that does a true "frag swap" every few months. For every piece you bring in, you get a ticket, and when each of your numbers is called, you get to go up to the tank and pick a piece that someone else has brought in.