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I've never used them so I don't know. But try www.aquariumobsessed.com ... this is where Twinreef is getting a 270gallon tank made now. You can also try PMing him and getting some information.
As for putting it in your living room, Billy added columns for support under his big tank, if I'm not mistaken. You want to make sure that you're perpendicular to the joists as well, spreading the weight across many.
i did add columns to my floor support with three sistered 2x10s..
i also ordered my tank from http://www.miraclesaquariums.com/ Derek was awesome to work with..
I'm using them now to build my sump. been 3 weeks and still waiting with no ETA. I'm not sure if i would recommend them. I have to see the finished product. JMO