Long story short, I left a ball valve open that connects my water storage tank to my main tank open. I turned the water on to fill up my storage tank and left for a few hours. Normally when my storage tank fills up a float valve will shut the water off. But since I had left the ball valve open I basically ran straight tap water into my tank for about four hours. Killed 18 lemon tetras and flooded my basement. I am so mad at myself.