Boron
Trace element present in sea water. Important for the metabolism of corals and calcareous algae. It is monitored via ICP analysis.
Detailed explanation
Boron is a trace element found in natural sea water at concentrations of approximately 4.5-5.0 mg/l. Its biological role in the aquarium is still being studied but is considered important for the calcification of corals and the growth of coralline algae.
Most synthetic sea salts contain boron in adequate quantities. Regular water changes usually keep the level in the correct range. Separate dosing of boron is rarely necessary.
An excess of boron can be toxic. Concentrations above 8-10 mg/l may inhibit coral growth. The excess usually occurs when using unnecessary additives or tap water with high boron content.
Boron is measured only by ICP analysis. There are no drop tests for aquarium use. For this reason it is often overlooked by aquarists who do not do regular ICP analysis.
In freshwater aquariums, boron is a useful microelement for aquatic plants. It is included in most plant fertilisers but in such low concentrations that it does not require monitoring.
If the ICP reveals an anomalous boron value (too high or too low) the first thing to check is the quality of the osmosis water and the salt used. A water change with good quality salt usually brings the value back into range.
Reference values by aquarium type
| Aquarium type | Recommended range |
|---|---|
| Marine (reef) | 4 - 6 mg/lNSW (natural seawater): 4.5 mg/l |
How it is measured
Only via ICP-OES analysis. There are no drop tests for boron in aquariums.
What happens when it is too low
Possible slowdown of coral calcification and growth of coralline algae.
What happens when it is too high
Toxicity to corals and invertebrates. Growth inhibition. Above 10 mg/l is considered dangerous.
Coralia Lab monitors this parameter with AI diagnostics. Tank Score alerts you when a value moves outside the recommended range for your aquarium.
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