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inside diameter. well experience is the foundation for knowledge, hows that for a fortune cookie response haha. just make sure ask around before you get to the real plumbing (not sure how experienced you are with stuff like that, no offense) so you don't end up wasting money, or worse.
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Nature V.S. Nurture: Nature Always Wins.
Current Tank Info: 12 gallon Aquapod reef with LED's, multiple nano's at work.
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