I don't own that tank, but from the pics I have seen it looks like the same procedure of most other tanks. Once you unscrew the top part of the tank from the base, it looks like its just a sample matter of slipping the glass off the tank section. The tank may not just slip off with a pulling motion so use a twisting motion while you pull.
This image may give you an idea of what I'm talking about...
Here's a video (this guy is loud and "hyper" but it's a good review):
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