I cleaned my top off bucket and forgot to plug it back in. The next day my buddy came over and my return pump which sits in a five gallon bucket had run dry. I had a rio pump in the bucket with the return pump so it ran dry to. I walked my friend threw getting the tank back up. Well the tank declind from there. When I came home 2 weeks later it looked like that. The rio pump had busted open and spewed oil and what not in the tank. I lost a bunch of corals as you can see, but I saved about half the tank.