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When choosing an aquarium, the height, the width, and even the length are very important. Standard glass aquariums from 20 to 55 gallons are typically 12” from front glass to back glass. When using artificial decoration this narrow width works well since there is a large assortment of sizes available. However stacking live rock in such a space will create an almost vertical rock wall that looks like a cliff. While the wall may appear adequate, wider aquariums (at least 18 inches wide front to back) allow for deep caves,...