Macroalgae

First time here?
Get $5 OFF your first order when you sign up and join our mailing list 🎉
👉 Create an account

Macroalgae for Sale

Macroalgae are large, multicellular algae used in refugiums, display tanks, and nutrient export systems in saltwater aquariums. On Light Fish you'll find macroalgae listed by reef hobbyists and cultivators, including chaeto (Chaetomorpha), caulerpa, gracilaria, halimeda, and various other species. In a refugium, fast-growing macroalgae like chaeto actively export nitrates and phosphates from the system as they grow, helping to maintain stable water quality in the display tank.

All macroalgae orders on Light Fish are backed by a platform-wide Live Arrival Guarantee and shipped in sealed, moisture-retaining packaging via priority or overnight carrier with weather monitoring. When adding macroalgae to a refugium, provide appropriate light spectrum and intensity — refugium-specific LED fixtures on an alternating light cycle with the display tank help stabilize pH around the clock. Harvest regularly to maintain active nutrient export.