I have kept pulsing xenia for a few years now because I love their motion. They can grow to weed like proportions if you do not keep an eye on them. With my colony I keep a close eye and prune it back once a month and give away or sell the frags. It is simply a high maintenance coral. If you just let it sit in your tank and grow they will grow fast and start to spread and attach to adjacent rocks. I try to frag my xenia before they get too close to other rocks. I do the same thing with a couple of patches of green stars. I cut them up before they spread to other rocks. So far I have not had to do any tank wide eradication :-). I just have a nice little shrub of waving blue hands that I prune from time to time.
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