CaribSea Aragamax Oolitic Select Sand 30 lb - This uniformly graded oolitic reef aragonite not only provides nitrate reduction in shallower aquarium beds, but also has an increase in pore water space which allows maximum diffusion rates of minerals and trace elements...

CaribSea ARM Calcium Reactor Media, Course, 8 lb - CaribSea ARM Calcium Reactor Media, Course, 8 lb, is a complete reactor media containing not only calcium and carbonate, but essential trace elements as well. ARM has nearly 50 times the strontium of other brands (7,390 ppm), is processed for immediate use, does not require rinsing, and has double the surface area of regular aragonite...