Are they?
Most liverock farms don't use concrete, but instead use limestone or even fossilized coral. Concrete would make lousy liverock, since it's not porous enough or attractive, and of course there's the alkalinity problem which would add years to the process of turning it into live rock.
GARF is famous for it's aragocrete recipe, though, which could be confused with concrete. That's certainly not what the rockfarms are dumping in the sea, though.
Are any rockfarms really using concrete? I guess I wouldn't be totally surprised by it, but I can't imagine why they'd ever want to.
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