Oceamo DUO Add-On P – Phosphorus (20 ml makes up to 10 L)

Oceamo DUO Add-On P provides a controlled phosphate source designed to prevent phosphorus limitation in SPS/LPS and mixed reef systems. When phosphate levels fall too low, corals may lose colour intensity, show reduced polyp extension, or experience slowed tissue growth. Severely phosphorus-depleted systems may also become more vulnerable to instability, including the increased likelihood of dinoflagellates or cyanobacteria taking hold.

Rather than chasing extremely low phosphate numbers, Oceamo recommends maintaining consistent availability within a safe operating range based on coral response and water testing. Carefully restoring phosphate when depleted helps maintain stability, colouration and metabolic function within the reef aquarium.

Why Phosphate Matters

• Supports coral tissue health, colouration and growth

• Helps prevent metabolic slowdown and pale appearance in SPS and LPS

• Low phosphate levels can contribute to unstable conditions that favour nuisance organisms (e.g. dinoflagellates, cyanobacteria)

• Essential for maintaining a balanced nutrient ratio alongside nitrate

• Particularly relevant in systems with strong nutrient export or low detectable PO₄ levels

Dosing Guidance

Each 20 ml syringe creates up to 10 litres of ready-to-dose solution:

✅ Method 1 – DUO Integration (KH only):
Add Oceamo Add-On P directly into DUO KH (do not add to DUO Calcium). Once integrated, phosphate is delivered in proportion to your system’s alkalinity dosing schedule.

✅ Method 2 – RO/DI Dilution (standalone dosing):
Mix 2 ml Add-On P with 1 L RO/DI water. Dose 5–10 ml per 100 L daily, ideally divided into multiple small doses using a dosing pump.
Only increase dose if signs of phosphate depletion persist, while staying within target ranges supported by coral response and reliable phosphate testing.

One 20 ml syringe can produce up to 10 L of diluted dosing solution, offering a highly economical correction and maintenance option.

Why Choose Oceamo DUO Add-On P

• Provides controlled phosphate support to avoid phosphorus limitation

• Helps maintain coral health and colour in low-nutrient or export-heavy systems

• Can be fully integrated into DUO KH for automatic nutrient stability

• 20 ml syringe yields up to 10 L of dosing solution for long-term use

• Compatible with both ICP analysis and trusted hobby-grade phosphate test kits

• Produced from high-purity raw materials and quality-controlled in Oceamo’s Austrian laboratory

• Supports long-term nutrient balance in advanced dosing systems

Dosing philosophy aligned with guidance from Dr. Christoph Denk, Oceamo Laboratory.

RRP: £19.99 (20 ml syringe makes up to 10 L)
Available in the UK from Reef Quest and authorised Oceamo resellers.

Frequently Asked Questions (FAQ)

📌 Will this raise my phosphate too quickly?
When used as diluted and introduced gradually, Add-On P allows controlled increases. Always adjust slowly and monitor coral response and phosphate test results.

📌 What are signs of low phosphate?
Possible indicators include pale SPS tissue, reduced polyp extension, slowed coral growth or recurring instability issues such as cyanobacteria or dinoflagellates.

📌 Can I add this to any DUO bottle?
No. Add-On P must only be added to DUO KH. (Similarly, Add-On N is only added to DUO Calcium.)