I wonder how many of the algae problems mentioned by some of the "SSB-haters" might be from "old" rock that needs to be cooked rather than from sand-trapped detritus... Just a thought. Also, it SEEMS to me that a well-stirred SSB should not collect detritus -- but maybe the under-the-rocks spaces will always be a problem. Of course, a well-stirred SSB won't denitrify, but neither will a BB. But even IF I'm right, the sand-storm issue remains -- how is it that some people have this problem and others don't (even at 40 - 50x t/o)? But who knows if I'm right??? I'm beginning to lean toward BB! But the jury remains out. thanks again for the input and especially links to past discussions and/or articles.