thats what I do. I use a box cutter and go underneath them and cut off the size section I want. I never use plugs for zoa's but superglue them to a peice of live rock rubble. then you can just stick the rubble rock in between or next to the main rock you want them to grow on (and repeat over and over!). or you can cut a frag off and glue it directly to the rock you want it on.