Selenium (Se) is an ultra-trace element associated with antioxidant protection and stress resilience in corals. In modern SPS/LPS systems, Selenium can be rapidly depleted and is often found below target when measured correctly. Because natural seawater levels are extremely low, accurate control requires ICP-MS (not ICP-OES).

For reefkeepers running structured trace programs (e.g., Oceamo ICP-MS with Custom Elements and Single Elements), maintaining Selenium at natural seawater levels can support overall coral health, stability, and recovery in high-demand environments.

Why Selenium Matters

• Supports antioxidant defenses and stress response in corals

• Frequently reads low in actively exported or high-growth reef systems

• Ultra-trace concentration means precise, small adjustments are essential

• Best maintained as part of an ICP-MS–guided trace strategy

Dosing Guidance

Oceamo Single Element Selenium provides ultra-fine control for safe correction:

1. 1 ml / 100 L = +0.05 µg/L (50 ng/L)

Maximum recommended increase: +0.05 µg/L per day (1 ml / 100 L daily)
Dose only when ICP-MS confirms a deficit and adjust gradually to target range.

Important (ICP-MS Only)

Selenium can only be measured reliably with ICP-MS. The optimal range is well below the detection limit of ICP-OES, so Selenium should only be dosed after ICP-MS analysis and monitored with follow-up tests.

Why Choose Oceamo Selenium

• ICP-MS–calibrated, pharmaceutical-grade ultra-trace supplement

• Produced and batch-controlled in Oceamo’s dedicated Austrian laboratory

• Designed for serious, long-term ICP management, not guesswork

• 1 L format supports ongoing maintenance in high-demand systems

• Integrated with the Oceamo ecosystem (ICP-MS → Custom Elements → Single Elements) for measurable, repeatable results

When reef stability and ultra-trace accuracy matter, Oceamo Selenium provides the precision advanced reefkeepers rely on.

RRP £29.99 | 1 L
Available in the UK from Reef Quest and authorised Oceamo resellers.

Frequently Asked Questions

1. Why can’t I use ICP-OES for Selenium?
   Selenium’s target range is below what ICP-OES can reliably detect. Only ICP-MS offers the sensitivity needed to dose Selenium accurately and safely.

2. My ICP-MS shows very low Selenium. Should I dose daily?
   Dose only per ICP-MS results and within Oceamo’s max +0.05 µg/L per day. Re-test with ICP-MS to confirm progress before increasing further.

3. What benefits should I expect from maintaining Selenium?
   Selenium supports antioxidant and stress-response pathways. Many advanced reefkeepers report improved stability when ultra-traces are kept on target, but results depend on overall system balance.