This is an interesting subject for a thread.
I have struggled for many, many years to enhance the appearance of Predator systems. The main problem lies in the fact that Triggers, Arothons, etc, find the natural attractive additions as a tasty morsel. Although I have no concerns about Groupers, Snappers, & Barracuda's eating fancy Corals and crustaceans, the destructive few, make it a frustrating task.
After attempting to introduce many, many, types of natural decors, I finally found that "Plated Montipora" are allowed to flourish in peace!! They must contain some sort of defencive mechanism that repels the inquisitive fish.
I want to share the pictures with you all. I cannot fathom-out how to upload on this Forum. I have had many unsuccessful attempts, but to no avail!!