edited - thought you referenced a xenia (must have been from the other post I was reading)
the Super glue gel works fine (any brand)
wipe the zoa base with a towl to get as much slime and grime off then put some SG gel on the rock or what ever you are mounting them too and set the Zoa base in the gel. I let mine set for about 10 minutes before returing to the tank.
Oh - and clean the rock surface also. clean any slime algea or other loose stuff off the surface.
