When you mean vacuum to aid cleaning your tank, Do you mean while doing a water change, to vacuum/siphon your sand bed and rocks? Or do you mean vacuuming the detritus from your sump? If it's for vacuuming your sand and rocks, you can use a vinyl hose or one of those gravel cleaners. If it's for your sump, then you can get a mini wet/dry vacuum. That's what I use.