I dont have any man made live rock in my tank or have I had any experience with it. However if it served the same purpose of housing bacteria just as well as the real stuff but at a cheaper price I would use it. Eventually it would get covered in coraline and noone would know the difference. I'd probably mix it in with some real stuff if it didn't look that great but if it was easy to stack and aquascape with I wouldn't be against using it.
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