Reborn Calcium Reactor Media 8.8lb - Two Little Fishies

Reborn coarse aragonite is sourced from fossil skeletons of reef-building corals collected from sustainably managed sites in the Western Pacific. This origin matters: the material's natural mineral profile means that as it dissolves inside your calcium reactor, it releases not just calcium and carbonate alkalinity but also strontium and a range of trace elements that synthetic media cannot replicate. It is a straightforward, effective replenishment source for the elements your corals consume most rapidly.

The coarse, large-piece format is the defining characteristic of Reborn and the reason it remains a go-to choice for serious reef keepers running calcium reactors. Large pieces maintain adequate void space throughout the reaction chamber, allowing water to circulate freely and CO2 to diffuse evenly without dead spots. Fine or degraded media can compact over time and restrict flow — Reborn is engineered to avoid exactly that problem.

Reborn also dissolves completely. There is no undissolvable filler and no tendency to break down into a paste or sludge that requires frequent teardowns to clear. Maintenance intervals stay predictable, and refilling is straightforward given the 4 kg (8.8 lb) pouch size, which suits most mid- to large-format calcium reactors.

This product is appropriate for any standard calcium reactor setup where a coarse, high-purity aragonite media is specified. It is not a replacement for a properly tuned effluent pH and flow rate — those parameters still need to be dialed in for your specific system — but the media itself will not be the limiting factor in your reactor's performance.