Seachem reef fusion 1 and reef fusion 2 are the foundation of a system formulated to provide the essentials for the reef aquarium reef fusion 1 provides calcium while reef fusion 2 provides alkalinity when used together the reef fusion system will maintain calcium and alkalinity levelsreef fusion 1 provides not only 100 000 mgl of ionic calcium but also includes biologically appropriate levels of magnesium strontium boron iron manganese and molybdenum