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					Originally Posted by muck  Unless you can do what you want yourself it will not save you any money.Call Dave @ Concept for a new tank and save yourself the headache.
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 ^ +1 
Also FWIW, in answer to your other question, tempered glass would not be able to be cut. Once it's tempered that's pretty much it. When you see a drilled tempered panel, it was drilled first then tempered (at least that's how I understand it).
Actually at the best of times it seems rather difficult to cut used glass clean and straight. There is a sweet spot of age for glass where it's easy to cut. After holding back water and having silicone on it and stuff, it tends to behave in more unpredictable ways.