How big are they? It's hard to get a sense of scale looking at them (actually what's really weird is the picture of your tank room, the wood grain makes it look like the inside of a tank stand - it's the other things like light switches and plugs that hint at it not being 30" from one side to the other
) .. but those tanks honestly don't look that much larger than my 2 50g barrels. That's awesome. When I looked into water storage I settled on 50g's because of space considerations and anything with more capacity was just way too big).
Edit: Are these them?
http://www.premierplastics.com/utility.htm