I wish that I had sump on this tank!  It's not that I can't vacuum everything, it just seems never ending.  I usually do a 50-60% change once a week and maybe a smaller one in between if I see too many logs of crap.  Perhaps I just haven't really taken into consideration how much crap he produces.  His diet is pellets, roaches, lettuce, squash, bananas, grapes and the occasional chunk of turkey hot dog.  I feed once a day 3 x's aweek and twice a day for 2 as much as they will eat in 5 minutes or so.   Almost to spite me he usually craps a lot right when I'm finishing a water change.  What an ******* he can be!