As far as un-natural structure, placing it in depths where it can't be seen is a solution. In very clear water, I don't think seeing the nasty structure would be long term because I believe 95% of the structure you could place would soon develop a green or brown slime all over it.

Correct me if I'm wrong on that. Certain types of fish (maybe tilapia) might eat all that coating off??


Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."