Hows it going R2R I run a 60g display with a 10g sump and my 10g ATO last me 3weeks. How long does your ATO last? How big is your Total water volume and ATO? I gotta say as I kick my feet up and refill my ATO for the first time in 3 weeks, that this sure beats the heck out of using a Home Depot bucket for my FW revisor. Big tank owners! How big is your ATO and is it ever big enough!?