For you guys running a drip on large tanks with sumps, when the power cuts out how do you not lose a ton of water through the drain? I'm working on a tank now, it is looking like if the pump shuts off it will flow roughly 50 gal into the sump, if the sump is constantly at the drain level because of the drip doesn't that all flow right out? I'd like a drip system, however this is something I have no been able to find an answer to yet.