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Refugiums 101


Drs. Foster & Smith Educational Staff
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Introduction to Refugiums Introduction to Refugiums
Refugiums, small aquariums that either sit next to or hang onto an existing saltwater or reef aquarium, are used by a growing number of aquarists to continually cycle water into and out of the existing tank.
Typically containing aragonite live rock, macroalgae (plants), and a deep sand or mud bed, refugiums:
  • Provide existing aquarium inhabitants with natural food sources such as phytoplankton and zooplankton
  • Filter water naturally (dramatically lowering nitrate and phosphate levels)
  • Stabilize water conditions (especially oxygen level and pH)
  • Help control algae growth in the existing aquarium
  • Add trace elements back into existing aquarium water
  • Serve as temporary acclimation tanks for new inhabitants

Neighboring refugiums - those set up next to, or nearby, an existing aquarium - can also reduce the number of necessary water changes.

Hang-on refugiums are either an acrylic box that hangs on the outside of the primary aquarium, such as the AquaFuge External Hang-On Refugium, or a small acrylic box that attaches to the interior wall of the primary aquarium, such as the In-Tank Refugium.

Refugiums offer an ideal natural solution for enhancing and maintaining healthy conditions in an existing aquarium.

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