I did the same as gbeef. I have some gsp but I isolated it to one rock. I did the same with my kenya tree but eventually got tired of picking up the branches and got rid of it. As far as the xenia goes it will always move up towards the light. You can try moving it to the highest point in your tank so it cant go anywhere or isolate it on the bottom if your tank isn't too deep or you have stong lighting.
HTH
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