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there is a problem with an empty tank. There is an old adage, "the more places you give your fish to hide the more you see them". Fish need places to hide to feel comfortable, if not they remain stressed and are prone to sickness. It will also make it impossible to manage aggression as well if you don't give the weaker fish an out.
Just for the theory sake. So you want s cube of glass with no rock visible? You would be amazed at how quickly the parameters go off if the tank isn't cycled with rock. I struggle with it on my hospital tank and I end up doing a 50% a day water change to keep up. With that being said the rock or media doesn't need to be visible. Many of us have extra rock or marine pure in our sumps to augment what is in the tank. I would just load up your sump with marine pure if that is what you are interested in. But this doesn't solve the problem I stated above, these are living animals with needs and fears, not art.
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