I've wondered about this as well. How deep do you want to make the cut? wherever it is will determine the height of water in your display. I would try a drill press with your diamond hole saw to make the beginning and end of the slot. The corners should be round to reduce stress. As for the center I'm not sure that hand tools will work very well, but slow, careful work with diamond cutting blade on a small angle grinder might work. Post pics if you do it!
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