Features: Biologically ideal strontium supplement for reef aquariums A sufficient supply of strontium is as essential for the growth and well-being of reef building corals as calcium. In the reef aquarium, the strontium concentration can drop rapidly to low values due to biological processes, precipitation and incorporation into the limestone skeleton. Tropic Marin ® BIO-STRONTIUM creates a natural environment in the aquarium and delivers strontium and carbon dioxide in a natural, biologically-available, powdered form and thus supports the healthy development of coral. BIO-STRONTIUM does not disturb the ionic balance in contrast to the single addition of strontium chloride. Benefits Biologically ideal strontium supplement for reef aquariums Creates nature identical conditions in aquarium Supplies essentially strontium and carbon dioxide in natural and biologically-available form Do not disturb the ionic balance (in contrast to the single addition of strontium chloride) Only natural substances are formed when dissolved: no chelates, no phosphates, no nitrates