I always use lugols iodide solution when fraging. My success rate is great for the frag and main colony. Take a bowl with tank water and use the lugols (enough to turn the water to a tea color) place the main colony in the bowl , always use a new blade on your scalpel and place it in bowl also . Soak the new plugs on some regular tank water to get the air bubbles out of them . Now your ready to cut, make sure you cut between the polips thru the mat then scrap under polip taking a little of the plug or stone you are fraging from let fresh cut polip and main colony soak in lugols solution a couple minutes. Pat your new plug dry and put a few drops of gel super glue on the plug , with some tweezers or scalpel place the polip on top of the glue making sure polip is facing up and no glue gets around the top of the polip, place in solution a couple more minutes and place back in your tank it should be fully headed in about a week and if done right it will open in a day or so. Good luck and hope this helped.