ummmm How would it over fill with a overflow???if the tank water of the main tank drops below overflow level thats in no more water going down.Even of you sump broke you water level in your tank wouldnt drain all. 
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75gal RR Tank with 2 Seio 620 and 2 maxijet 1200, 2 150watt HQI and 2 Antic PC, Turbo Floter Skimmer with 9.5 Mag to tank and fuge, Sump is 75gal with a 22gal fuge, 40gal Auto topoff.
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