Product Information

API Marine Algaefix Algae Control for Saltwater Aquariums

API Marine Algaefix – Reef-safe marine algae control solution that helps eliminate Green Hair Algae, Red Slime Algae (Cyanobacteria), and Brown Algae in saltwater and reef aquariums. Safe for marine fish, corals, and invertebrates when used as directed. Ideal for controlling nuisance algae and reducing aquarium maintenance.

Advanced Algae Control for Marine & Reef Aquariums

Nuisance algae is one of the most common problems faced by marine aquarium hobbyists.Whether it’s Green Hair Algae covering live rock, Red Slime (Cyanobacteria) spreading across the substrate, or Brown Algae coating surfaces, excessive algae growth can affect both the appearance and stability of a reef aquarium.

API Marine Algaefix is specifically formulated to control many common forms of nuisance algae in marine and reef aquariums while remaining safe for marine fish, corals, and most invertebrates when used according to directions. It is designed for use in reef aquariums, fish-only marine systems, and FOWLR setups.

Why Marine Hobbyists Use API Marine Algaefix

• Controls Green Hair Algae
• Helps control Red Slime Algae (Cyanobacteria)
• Controls Brown Algae growth
• Safe for marine fish when used as directed
• Safe for corals and reef aquariums when used as directed
• Does not discolor aquarium water
• Does not cause foaming
• Can be used as part of ongoing algae management
• Suitable for marine and reef systems
• Made in USA

What Types of Algae Does API Marine Algaefix Control?

Green Hair Algae – One of the most common reef aquarium algae problems.Often appears as long green strands growing on rocks, pumps, overflow boxes, and coral skeletons.

Red Slime Algae (Cyanobacteria)Forms red, purple, or dark-colored mats on sand beds and rock surfaces.

Brown Algae – Common in newer marine aquariums and systems with nutrient imbalances.

Dosage Instructions Initial Treatment Add:

1 ml per 38 litres (10 US gallons) or 5 ml per 189 litres (50 US gallons)

Repeat every 3 days until algae is controlled.

Remove dead algae through siphoning or manual removal.

Maintenance Dose Once algae is under control: Dose once weekly to help prevent future outbreaks and reduce maintenance requirements.

Suitable For

• Reef Aquariums
• Marine Fish Aquariums
• FOWLR Systems
• Soft Coral Tanks
• Mixed Reef Aquariums
• Fish & Live Rock Systems
• Algae Management Programs

Country of Origin USA

Expert Recommendation from Something Fishy

API Marine Algaefix should be viewed as an algae control tool, not a substitute for solving the root cause of algae growth.

In our experience, excessive algae is usually linked to one or more of the following:

• High phosphate
• Elevated nitrate
• Overfeeding
• Poor source water quality
• Excessive lighting
• Insufficient nutrient export

Marine Algaefix can help regain control of an algae outbreak, but long-term success typically comes from addressing the underlying nutrient source.