The water in your tanks would flow from one tank to the other until everything levels out. So if all of your tanks are level then no one tank should flood... unless all three tanks flood. So if the return pump should fail, then the water level in all of your tanks will continue to lower (and fill the sump) until the siphon to your sump is broken. You just need to ensure that the sump is large enough to accomodate the extra water volume if the power should go out. Basically, as long as all of your tanks are level, it will act like one big tank. The biggest potential problem I see is having one of your U-tubes clogging. If that happens, then you can have a flood, since water cannot flow to the next tank easily. Multiple U-tubes and screens should reduce that risk.
-Richer
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