Two Little Fishies ReMag 4kg Magnesium Media For Calcium Reactor

ReMag is a magnesium-rich natural stone sized to blend well with ReBorn and other calcium carbonate media for use in calcium reactors. ReMag makes maintaining the magnesium level in your reef a no-brainer. Simply use ReMag in a calcium reactor according to the directions to supply the magnesium your corals need. Aside from saving you time and money, it gives you more reason to enjoy watching your corals grow.