+1 to the nassarius snail. In my 90, I have a sand sifting starfish, a Dragon Goby, and snails to keep the sand bed clean. That added with good flow and you shouldn't need to suck to much up. I don't like disturbing my sand bed to much. You'd be surprised how well a sand sifting goby will do to clean the sand bed. Just my humble opinion, i hope this helps.