I think it looks great where it is. First thought is, "That's a 90 gallon tank?" That rock is perfectly proportioned for the tank, IN PERSON. When photographed it makes the tank seem much smaller than it is because the rock is the frame of referance, people don't expect such a large rock and scale their idea of the tank to fit the rock. With fish, or more planted, then i think that issue is resolved, there are other points of referance.