When I feed my tank I find that most of the food is sucked down the overflow box before the fish can eat it. I have heard of a device called a delay box that the return pump plugs in to and you can push a button shutting off the pump for a set period of time then the pump turns back on automatically. I would rather use this device than plugging and unplugging the pump from the wall. Has anyone else heard of this device and could point me in the right direction to purchase one? I have tried Google and eBay but no luck.