Secure caribsea frag zone rubble to bare bottom?

[Natedogg1978]

Can someone suggest a good way to secure rubble rock to a bare bottom temporarily? Would like the option to move at a later time if needed. Example, the Goni in the pic has been turned on its side by one of my clownfish. Would like an easy temporary fix. Thanks

 

[Subsea]

Egg-crate/Light Diffuser ?