I don't think you got 50lbs of live rock, did you actually see the weight on a scale? I got 60lbs of live rock for my 90g and had to put some in my sump as it wouldn't all fit in the tank. Take a look at people's tank photos and see what style you like. Some like their tanks open, some like lots of shelves and arches and some like a big dense wall of rock against the back of their tank. If you have good porus rock the lb per gallon rule of thumb isn't a must by any stretch. What's important is that you like the look of the tank because if you don't why have it? You can also get creative and use clear acrylic rods and black zip ties to design your rock work.
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