I don't have a DSB
, but when I do water changes, just briefly run the vaccum head over the sand. It will get some of the buildup and die off, uneaten food, and all the other stuff. You may lose a little sand, but for the most part it will stay in the tank. Like already mentioned, if you are using the bucket method that is (and not a python) just scoop the sand back out of the bucket, and put it back in your tank.
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