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That's pretty much exactly the scheme I've always used for tank boundaries, and it worked great for previous versions. The problem with MA3 is determining what's "inside" or "outside" of objects in a very complex 3D environment. The fish will be able to peck at the coral, which means they need to know exactly where the boundary of the object is.
As I look around my desk, I see a similar situation - a mouse, keyboard, speakers, stacks of papers, a desk lamp. I can reach out and touch the lamp shade, and I can see when my finger is about to make contact, but I wouldn't have any idea how to write an algorithm to do that.
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