Seachem Reef Phosphorus™ is a concentrated (5,000 mg/L) phosphorus supplement specifically designed for ultra-low nutrient reef systems (ULNS). While many reef keepers struggle with excess phosphates, high-end systems with aggressive filtration or heavy coral loads can become phosphorus-limited. Reef Phosphorus™ allows for the precise addition of inorganic phosphates to prevent coral "starvation," promoting better tissue health, polyp extension, and faster calcification.
Reef Phosphorus™ is engineered to provide a safe, inorganic source of phosphorus to maintain the delicate biological balance of a modern reef.
Ultra-Pure Formulation: Provides a clean source of phosphorus without the nitrogen or organic impurities found in many food-based nutrient boosters.
Promotes Coral Vitality: Prevents "Pale Coral Syndrome" and tissue recession caused by a total lack of detectable phosphates in the water column.
Fuel for Beneficial Bacteria: Helps maintain the bacterial populations required for effective carbon dosing and nitrate reduction.
Precise Dosing Control: The concentrated liquid formula allows for micro-adjustments, ensuring you can reach the "sweet spot" of nutrient levels without overshooting.
Safe for Sensitive Inhabitants: Completely non-toxic and safe for all marine fish, corals, and invertebrates when used to maintain natural seawater levels.
Why would I want to add phosphorus to my reef? In very clean tanks, corals can stop growing or lose color if phosphates drop to absolute zero. A small, controlled amount of phosphorus is necessary for the metabolic processes and zooxanthellae health of all corals.
How much Seachem Reef Phosphorus™ should I dose? The standard dose is 1 mL per 100 L (25 US gallons) to raise phosphate by 0.05 mg/L. It is critical to test your water before and after dosing to ensure you stay within your target range.
What is the ideal phosphate level? Most successful reef keepers aim for a stable phosphate level between 0.02 and 0.07 mg/L. Levels consistently above 0.10 mg/L may begin to fuel nuisance algae or inhibit calcification.
Seachem Reef Nitrogen™: The perfect companion to balance your "Redfield Ratio" by adding nitrate alongside phosphorus.
Seachem Reef Plus™: Provides the amino acids and vitamins that corals need to fully utilize the added phosphorus for growth.
Seachem PhosBond™: Keep this on hand as a safety measure to quickly remove phosphorus if you accidentally overdose or if levels rise too high.
