you could trim it if are handy with the knives if not use the epoxy.

The skeleton of that type of coral is quite porous and prone to shattering when cut with clippers. Do you have a Dremel or wet tile saw? One of those or even a wet bandsaw would be ideal.

Sometimes I've been able to use zip ties to get coral to stay in place. That might work for you if their are any holes in the rock that you can feed one through.

Hey, thanks for clarifying, you can trim the skeleton on branching torches, hammers, frogspawn.... As long as you make sure you don't cut through tissue, so to be safe make sure there is 1.5" or longer on the branch from the heads, other then that the best adhesive for this application is marine epoxy as opposed to any type of gel glue, hope this helps!

Steve

epoxy
 

the marine epoxy is a solid 2 part epoxy(tunze or other similar brands)-do not use a gel type marine epoxy as it is toxic until it cures

Thanks, Steve. Unfortunately, there's no 1.5" long "stem". All seven heads are kind of stemming from one thick bulge, so trimming it might not be an option, I guess. I will think of making a small base for it from sand and glue, first, and then attaching it to this base. Then it should be easier.

Wow, very nice tank shot.