I just downgraded my 2 ADF's from their 10 gallon to a 5.5 gallon (they just hang out around the edges and in their floating log anyways so seemed like a waste of space and my cleaning efforts, not to mention much easier to move a smaller tank when I do move!) and I have been wrestling with the idea of trying sand instead of gravel for a long time now. They eat out of a terra cotta pot bottom thing, so I don't think they would eat the sand, but what are people's experiences with sand and ADF's? Or sand in general? I love the look of sand much better than their current river type gravel, but don't know if sand is difficult or if it'd be worth it? Any opinions would be great! Thanks.