Well, my return pump is down today while i am at work. Received a phone call from my wife said my tank is half full and water is all over the garage. I have her restart the iwaki MD40RLXT return pump couple times but no luck. I have to call Yinger over to figure out the problem. Anyway, he thought something is wrong with the bearing or the pump is burn out. After an hour of frustration finally we decided to siphon the water from the sump into the tank and have the tunze keep the circulation going. Anyway, i got home, took the pump apart. After removed the impeller housing i found the twin spot wrasse got stuck inside the impeller. Well, the tank is now up and running. Hopefully nothing will happen to the corals.