How often if ever do you vacuum your sand bed? I’ve never really done it on a 22 yr old tank. Top layer in front gets stirred once in a while as the glass cleaner blows by but the rest just has always accumulated dead snail shells misc detritus etc…. Has anyone ever gone from deep sand bed to shallow and what was your result? I’m hesitant to do anything but if theres huge benefits Id consider now before things get re-grown out.