Two Little Fishies

ReBorn Calcium Reactor Media

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Why does BRS recommend this?

Reborn calcium reactor media is harvested from a sustainable source in the Western Pacific Ocean. Two Little Fishies pre-rinses their media in RODI water, as well as manually removing any snail or clam shells before packaging. Reborn is one of the only calcium reactor medias that still uses legally sourced coral bones and is our preferred choice for a low cost calcium reactor media that will not clog like many others in a calcium reactor.


Two Sizes Available

  • 8.8lbs (4 kg)
  • 44lbs ( 20 kg)


Replenish calcium and carbonate alkalinity for the proper skeletal growth of your corals.

  • Aragonite pebbles from fossil corals
  • Use ReBorn in a calcium reactor
  • Dissolves completely - Porous structure promotes carbon dioxide penetration for uniform dissolution
  • Replenishes strontium and other trace elements
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Product Questions

I used to have this in my sump as recommended from LFS. I am wondering if I could use this instead of sand on my bared bottom reef tank?
Question by: CJ on Jan 24, 2017, 7:24 PM
Awesome question! You absolutely can use this in your tank as a substrate. It's just like using a bag of crushed coral. :-)

Answer by: Randy on Jan 28, 2017, 10:02 AM
What is the shelf life of this product? I am debating on just buying the 44lbs instead of buying two of the 8.8lbs, and just have plenty available when it is time to add more to the calcium reactor.
Question by: Michael Pham on Jul 2, 2016, 2:43 PM
Hey Michael,

You can definitely go with the 44lbs. The product is simply dry coral skeletons, so no degradation of any kind will take place in air.
Answer by: Valerie on Jul 5, 2016, 4:21 PM
What is the recommended PH inside the reactor for this media?
Question by: jordan hecksel on Jan 18, 2016, 6:54 PM
Great question!
The best pH is typically between 6.5 - 6.7 Feel free to let us know if you have any further questions!
Answer by: Connor on Jan 26, 2016, 7:30 PM