Hey, as some of you may know, i am going to be starting up a little business slowly in the next couple of months (thread here: http://www.monsterfishkeepers.com/forums/showthread.php?535943-Online-business). I decided on a cheap, easy, and not bad looking way of housing tanks efficiently: a rack system. Basically i am going to stack cinder blocks on top of each other and thread lumber through the holes in the cinder blocks. it is going to be 4 cinder blocks wide by 3 tall on each side, with a new row of 4 10 gallons every cinder block(16"). My question is are 2 of these pieces of wood really strong enough to hold up 4 10 gallon aquariums? I dont think so. How many pieces of this wood am i going to need to support the aquariums? Here is the wood: http://www.homedepot.com/p/2-x-4-x-8-2-Pressure-Treated-Lumber-218458/100077807?N=c3sr#.UXQz1b9yHF8