I've got a nice size colony of Pom Pom Xenia going, but it took me three tries to get a frag to survive. From what I've heard, Xenia either likes your tank, or it doesn't. The first two frags I got from my LFS died and the frag I got from my friend has taken off. If 3 out of 5 are looking good, you should be fine. If the other two die off, don't worry, once that stuff get's going, you'll be trimming it back frequently. If you can, keep the Xenia on a rock of it's own, away from all your other LR. It can take over a tank fairly quickly.