How many gallons does your tank hold? I'm assuming you do an 80 gallon water change. If it was big enough I would do a R/O auto drip with with an overflow drain. Drill a hole where you want your waterline to be, of course use bulk heads to stop leaks and run a flex hose or pvc to a place you want the water to drain to(sink/big garden). You will be able to enjoy your hobby much more when can just you sit back and watch your fish instead of constantly working on the tank. There are threads that will help you understand the different types of drip systems.