The fish are completely done in 3d, therefore they can rotate, everything else that you see is not, only the parts you are seeing are. For instance take an apple and cut it in half vertically. Now squat down exactly at eye level and look at the uncut side. There is nothing there to tell you that the other half of that apple on the back isn't there, but it isn't.
You cannot and will not be able to rotate the tank. I don't think people really want Jim to spend the next 5 years working on corals just so you can rotate the tank to the exclusion of everything else?
Welcome to the forum Tom.