Water Change

On Sunday 11/25 we performed the third water change. It had been close to three weeks since the last water change and my Xenia wasn't pulsing as much as it usually does. I had about 12 gallons pre-mixed to a SG of 1.023 and heated to a temperature of 78 deg F to match the conditions of the tank. Since I recently had some surgery I had to have my wife lift the buckets of water. I wonder how long I can use the surgery as an excuse? Hopefully, through the winter shoveling. ;-)