opinions on subtrate in your nano

[Koleswrath]

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