I have a 180 gallon tank with a light sand substrate stocked with peacocks and some larger haps. The problem with sand substrate is that is shows every piece of poop that settles and can look very unsightly. I discovered this vac and decided to give it a try as it seemed to be much easier to use than my python since it does not have a hose and is also uncorded. It worked very quickly to pick up all the solid waste, leaving my tank looking pristine. I use it at least twice per day, every day. Positioning powerheads where they push all the waste to one side means I can vac the tank, clean the vac filter and put it up in less than 10 minutes. Batteries last me roughly a month since I swap them out before they really start to drop off. One of the best investments I have made for my tank.