For fragging do an iodine dip for 5-7 seconds then into tank water for as long as you want, then back in the tank in lower flow.
New frags from others I always use CoralRx. Right after acclimation take tank water in two tupperware containers. One for the dip one for the rinse. Add CoralRx at recommended dosage and use a turkey baster to keep water moving for 2-3 mins. Rinse frag off in the rinse container and add to tank.
plus one on lugols I am about to get some sps frags how much lugols per gallon???