yes they would swim in and out of the bottom and as for coral you can just build up your rock if you like. I see it being set up as an all fish aquarium though. Right now I have some live rock and coral in my set up but you dont really see it until you look down the upper tank. It is a very unusual look in person. Its almost like there is another dimension to the tank. Dont really know how to explain that part of it
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