You can disregard my post if you want as my tank is a little bigger than a nano. But if you have a sufficient amount of flow to keep your detritus suspended in your water column, there's really no reason to be touching your sandbed. The more you keep your hands out of your tank the better. It's just my opinion and there's a lot out there that would disagree. And I have very little clean up crew and they're never on the sandbed anyways. I do have a diamond headed goby that stirs up the sand but he never really leaves his favourite hang out spot which is quite small
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