you can get some construction adhesive and 2 hooks and glue it to the concrete, that stuff is amazing and will hold a hell of alot of weight, and then you won't have to drill into the concrete.
Rona, home depot, any hardware store will have the "PL" construction adhesive and you can find nice hooks there to.
Josh
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180 gallon reef tank with 80 gallon sump, 2 External overflow boxes ,3 drilled returns,Vertex 100 skimmer, Jager 250 watt heater, Stealth titanium 150 watt heater, 3-500 GPH return Aqua Globe pumps and 2 corelia power heads 
My tank so far
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