A saltwater reef aquarium captures the beauty of coral reefs in a compact tank: shimmering fish, living corals, porous live rock, and a diversity of invertebrates all working together. A successful setup blends aesthetic appeal with sound biology and dependable maintenance routines.

Planning is the foundation. Decide on tank size and budget, then map out space for lighting, filtration, and water movement. Larger tanks offer more stability and a broader selection of species, while smaller tanks require stricter husbandry and careful stocking.

Live rock is the cornerstone of a reef’s biological filtration. It hosts beneficial bacteria that process ammonia and nitrite, supports microbial life, and provides natural grazing surfaces for corallivores and detritivores. Aim for a mix of rock shapes and porosity to maximize surface area and refugia for shy creatures.