I'm not gunna blow smoke up ya, I don't like it sorry, there's plenty of ways to accomplish low nitrates with out adding rocks and plastic to the back wall for possible falling objects, and decreasing overall tank depth. Ive never seen anyone do this successfully but it could be a first..It reminds me of a countertop mosaic backsplash, and looks very unnatural to me as most reef tanks already look unnatural. Plus it's just going to get covered in coraline algae, possibly. I'm not sure the juice is worth the squeeze on that, but thats what's great about this biz what I think doesn't matter, it's in your house so if you like it that's all that does matter. That's my opinion, no more than that