Good question. I don't really know myself, but, another thought is that schedule-80 is also grey, a lot of people use it for the looks, so that's an option for you as well. It's for much higher pressure so it's even thicker (other than looks it's total overkill for an aquarium).
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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