Seachem Reef Fusion 2 is a concentrated alkalinity supplement formulated to help restore and maintain proper carbonate and bicarbonate levels in reef aquariums. Designed as part of a two-part system, it supports stable alkalinity essential for the growth and health of calcareous organisms such as corals and reef invertebrates. This formula provides a balanced source of carbonates to help promote strong skeletal development while supporting overall reef stability, making it an ideal choice for routine reef aquarium maintenance.