You were fortunate your LFS
owner offered you a frag from a p.xenia coral for $5. Usually this particular coral is a real money maker for FS's, at least this being true in my area. Shops cannot seem to keep up with demand.
My understanding is that this coral is very prolific in a well run tank. I hope you have lots of success. There are folks I am aware of who trade LFS
's their p.xenia frags for new corals. And, what a great way to increase one's collection!
I have not ever had great success with growing p.xenia in spite of the fact they are notoriously easy and rapid growers. I have no idea where I have gone wrong!
Any way, thanks for sharing your story with us, DK. Have fun on your day off watching your xenia pulse. It can be a really neat sight. And the one hint I have been offered regarding xenia is to place a frag touching an area in your tank where it can spread. The advise I was given was to let it grow up an area on the glass. A razor blade then makes short order of removing a portion to trade or sell...