Eww. Holdfast is even worse, in my opinion. It just crumbles and DOESN'T stick...like trying to use scotch tape to hold down your coral.
I don't get why we can't get a @$#%& stick of epoxy that actually works, and DOESN'T send the tank into a frenzy. We can go to the moon, switch inner organs and clone sheep. But nooooo....a stick of epoxy that works is just too hard.
Meh.
See? I feel your frustration
P.S. Your skimmer will stop....eventually. At least it's not hanging on the back of your tank, in a carpeted living room
*relives bad memory*...