Oceamo DUO Add-On N provides a highly efficient, ammonium-first nitrogen source designed to prevent nitrogen limitation in SPS/LPS and ULNS reef systems. Corals and their symbiotic algae preferentially assimilate ammonium before nitrate, making this form more metabolically accessible than traditional sodium or potassium nitrate products, which can also contribute to unwanted ionic loading.

Rather than chasing a specific nitrate value, Oceamo recommends focusing on preventing nitrogen deficiency—which may present as pale tissue, weak polyp extension or stalled coral growth. As explained by Dr. Christoph Denk (Oceamo Laboratory), nitrate is the low-energy end of the nitrogen chain and only accumulates once ammonium and other preferred nitrogen sources have been fully utilised. Therefore, a mild nitrate rise after dosing simply indicates sufficient nitrogen availability rather than a harmful excess.

Why Nitrogen Matters

• Prevents nitrogen limitation in nutrient-poor systems

• Supports coral tissue tone, colour intensity and growth

• Particularly relevant in ULNS and SPS-dominant aquariums

• Helps restore nitrogen availability after heavy export or low-nutrient regimes

• Better aligns with coral physiology than dosing nitrate-only salts

Dosing Guidance

Each 20 ml syringe creates up to 4 litres of ready-to-dose solution:

✅ Method 1 – DUO Integration :
Mix 2–3 ml Add-On N per 1 L of DUO Calcium. The Add-On will then dose proportionally to coral uptake via your existing DUO dosing schedule.

✅ Method 2 – RO/DI Dilution (standalone dosing):
Mix 5 ml Add-On N with 1 L RO/DI water. Dose up to 10 ml per 100 L tank volume daily, ideally split into multiple small doses through a dosing pump (e.g., hourly over 24 hours).

Only increase dose if coral paleness, stalled growth or nitrogen-deficiency symptoms persist.

Why Choose Oceamo DUO Add-On N

• Ammonium-first formulation for superior coral bioavailability

• Avoids unnecessary sodium/potassium loading from nitrate-only products

• Supports stable nitrogen flow without over-reliance on nitrate levels

• 20 ml syringe creates up to 4 L of solution – highly economical

• Fully compatible with Oceamo DUO for automatic nutrient delivery

• Developed by analytical chemists and supported by ICP correction strategies

• Ideal for advanced SPS/ULNS users, ICP/MS trace programmes and Moonshiners-style systems

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

RRP: £19.99 (20 ml syringe makes up to 4 L)
Available in the UK from Reef Quest and authorised Oceamo resellers.

Frequently Asked Questions (FAQ)

📌 Will this raise my nitrate levels?
Possibly – but this is not harmful. As explained by Dr. Denk, nitrate only accumulates after ammonium and other preferred nitrogen forms have already been used by corals and microbiology, indicating nitrogen availability rather than excess.

📌 Why not just dose potassium or sodium nitrate?
Nitrate-only supplements add extra potassium or sodium that can skew ionic balance over time. DUO Add-On N provides an ammonium-first approach that aligns more closely with coral physiology.

📌 How do I know if my tank is nitrogen-limited?
Common signs include pale SPS tissue, poor growth, reduced polyp extension or persistently low nitrate despite feeding. ICP and macro-nutrient trends can help guide adjustment.