Gabe, you may not have seen one lose siphon, but it does happen. The key word is the "correct overflow box". My point was that most of the boxes out there are crap. I asked the lfs I got the tank and u-tube type box from about my problem and they said they had never heard of it flooding either, yet it did religiously. What I don't understand is why I kept it. I never had a problem with the Lifereef box. But, I knew my next tank would be a reef ready tank. When we had the flooder, we would both hold our breath when the power went out and run to the tank when it came back on.