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I think it looks great. It`s hard to figure out LBS per gallon as some LR is heavier or lighter. You`ve got alot in there but when it comes to biological filtration you have it covered. Great looking tank.
The tank is 180 gallons. The rock structure itself is fairly open on the inside. The Coral Beauty Angel can traverse from one side of the tank and back without being seen -- it's pretty much a giant network of interconnected caves.
I think once your tank pinks up and you have some more fish in there, it'll be a beautiful tank. As for too much rock, no I think you have a great amount.