Only way is to go top down or through the side. You have to have the lens perfectly perpendicular to the glass to get a good clear macro. Unfortunately with curved glass this is impossible, which is why most people into photography don't by bow fronts or other curved glass tanks.
Best solution is make a top down camera box, it's a simple DIY project but don't use a Ziploc bag as I assure you this won't work.
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