Mike,
I had a few in the past and just recently (5-6 months) have a happy one. First one jumped out of the tube right away and was never seen again. Second had it's head ripped off by a naso tang, didn't survive that, not that I can blame it. The third was acclimated really slow in my sump/frag section, then after a week, moved it in the display. They are sensitive to salinity changes. I keep my alk between 8.6 and 9.6 dkl and ph at 8.2 //dave