Hi bro JMW, wats a DT? Btw i wen down to polyart last nite n there was this very friendly n helpful shop asst. I was telling him abt having a sump but was afraid if the water pump would die on me n flood my cabinet. He then said he also DIY his own but by drilling holes along his inward flow pipes so if it happens dat the sump pump motor is dead, the inward pipes will still suck in water but wen the display tank water level goes below the first or the 2nd hole along the inward pipes, air will enter it thus replacing the tank water n this will prevent the tank water from continuing its journey back into the sump...
I just woke up so i might not make sense but this might work... yawnnnnnn