Pife,
Such things are done prior to any other fabrication being done. That way you only lose raw materials, not a finished product. The best method, for longevity of the glass, is using a Techni. That is not something that folks will have in their garage, nor are they likely to buy one for notching a tank. CNC waterjet @ $100,000 +++. With enough time, it can be done by hand, but the results are dismal at best, and still need professional finishing, to insure stress fracturing is very minimal, or not present at all.
It is best to refer such things to professional glass fabrication shops for assessment as to practicality, particularly when dealing with a finished product.
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"Things should be made as simple as possible, but not simpler." (oft attributed to Einstein; most likely paraphrasing by Roger Sessions; compactly articulates the principle of Occam's Razor)
Current Tank Info: 325 6' wide Reef
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