I am doing the same thing as zafirablanca pretty much. I am using a 20 gallon plastic tote with a lid. Got a float switch in the tank and it kicks the power head in the tote on every now and then to fill the tank. I also have a second tote that I prepair my water in once a week. I pump the water from the 2nd tote to the top off tote once a week before I make new water. Ater I set up an overflow and sump syster, I think I will route the top off to the sump instead of the tank. What do you guys think, leave it to the tank, or route it to the sump?