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how do stores do it

  1. How do the fish stores do it?

    Freshwater Aquarium Equipment
    I've always wondered how the fish stores and various pet stores maintain their tanks. In a Petsmart or Petco, all you see are powerheads or return pumps. Never anything to suck up the water. Does it all collect somewhere or what? I once saw a button which I think was meant to turn off all...