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  1. Only 5 years later.... I use 19mm polypipe for air circuits but have multiple open loops (no dead ends) just above each fish tank so the airline lengths can be all same length. More efficient and neater than a single main circuit at ceiling height that droops lots of confusing airlines. I also have two large airpumps per air circuit. WHEN one pump fails, the other pump still supplies air to tanks at a noticeably lower volume until you can repair or replace the faulty one. This method of redundancy removes the need for two (or three) air stones/filters per tank to save equipment costs
    2 points
  2. Black occie
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