Hi Bubbaque, i almost smell the acro in your pics of the colonys out of water.
Dont know your plan for relocation, what i did with some of my big pieces might help.
I drilled a small hole in the base to insert a piece of acrylic rod, then glue the rod in the acro.
After i just drilled in the rocks so i can insert or remove said colony with ease.
In this pic the pink acro on top has it on the base, the red planet on the right has it on the side.
Never lost a piece with this method (yet).
Good luck!