I got the Fluval FX5 for my 75G tank and I was thinking of the easiest way to do water change. If I buy a 25' tubing, which is enough to connects from the filter to the bathroom, and connect it to the 'OUT', have the FX5 on and start dumping water into the other end, which goes into the toilet. Then, to refill the tank, simply switch the 'IN' and the 'OUT' so that the FX5 pumps the water from the bathroom into the tank. That way, I don't have to make several trips with buckets full of water. I know water change for a 75G isn't much, but imagine if you do it for a monster tank. Has anyone tried this?