CaribSea ARM Reactor Media-Fine 1 Gal

ARM Reactor Media contains calcium, carbonate, and trace elements.
Nearly 50x the Strontium of other brands (7390ppm)
Precision grading (2-3mm) allows for maximum carbon dioxide penetration
No gastropod shells mean the lowest phosphate content (less than 1/10th of 1ppm)
Highest solubility of any reactor media (metastable at 8.2)