Safedad, Silverwolf, I've got my RDSB plumbed exactly how you are discussing in a IO ratchet-top bucket. The lid is easily removed, so it is easy to see what is going on. I do have about 2 inches of water between the top of the sand and the bottom of the elbows, and I get good flow through, but I haven't noticed any detrius build-up or flow patterns in the sand. I would recommend this pattern.
Russell
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