then if im right and you sprung a leak(again god forbid) wouldnt your ato keep dumping frshwater into your tank causing even more headache??

I decided to scap the canisters and go with a sump. For ease of pluming, I picked up the Marineland Model 2 sump filter. What i like about it has 3 slide out drawers for different media. Perfect for my use, also pluming is a snap as this filter is the model designed for the Deep Dimensions 150 cube. I am looking forward to the set up, the tank bulkheads will now be directly over the sump (in case of a snall leak). The sump will contain heaters, PH probe/controller, CO2 reactor, grounding probe and auto top off and it even has a chamber for a refugium - which I was thinking of doing a freshwater fuge just for algea. Not sure yet.