For the least amount of stress to you and the corals, (if you didn’t already do it) just pop off the stem of the plug especially on the shroom and zoas, (zoas just suck to frag in my opinion). For the Xenia, might be able to just peel off, if not get a nice sharp pair of scissors or a knife cut the body as close as physically possible to the plug and just superglue the coral to the spot you want it. For the gsp, should be able to peel off, if not either cut the stem of the plug off or just hide the stem of the plug in the sand. Just be aware, Xenia and GSP are some of the best and worst corals you could buy. They are the best because they survive through anything, and grow fast. The worst because the grow fast. TOO FAST, don’t be surprised if you find yourself cutting some out every couple weeks lol. Acans are either very easy to cut off or a sob. If they are encrusted over the plug, don’t even worry about it, just cut the stem. If not, if you have bone cutters, (sharp pliers) and cut close to the plug. GOOD LUCK!