Today I planned a 25% water change. Everything was going fine as usual. I began pumping the water from my basement water mix barrel into the display tank upstairs. Problem was I left the siphon hose in the display tank and drained 60% of the water and depleted all my mixed replacement water. After a long moment of panic and anger I settled down. Good thing CRA had pre-mixed water to buy. Jeremy saved my butt from a potential huge mistake. I can't believe I did that!!!!