I'm barebottom on my 20 gal. If I had sand in it I'd have huge dunes and barespots from the wp25. The 3 Koralia 425's I had previously didn't affect the sand too much but they also didn't move the detritus into the water column. In a small area it's tough to get the perfect amount of flow so barebottom is just what I find easiest.
Greg
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