I did the exact same thing with some tbs sand haha.. but it's still pretty fine. I ended up using crushed coral for the higher flow areas and it seems to have worked out well. But still, if you get any sand sifters or burrowing creatures they will lift it up into the water column. I'm wondering if flow directed at the overflow would help to remove it and send it down to the sump. I was going to start a thread asking about it sometime.Thanks! The sand has been drifting a bit on the side opposite from the Gyre. I'm a big fan of fine sand beds, so intend on making this work somehow! I'm planning on getting some sand from TBS which is pretty coarse, so I'll put that in the high flow ares. Hopefully when I get some clams and things plopped down in the sand that should also help.