Reef chemistry is a balancing act. When phosphate crashes, nitrogen bottoms out, or a trace element quietly runs down over months of skimming and export, an all-in-one supplement rarely fixes just the one thing that's off. It tends to shove three other parameters at the same time. That's the problem Fauna Marin built the ELEMENTALS line to solve — and the full range is now in stock at Marine Concept Supply.
What ELEMENTALS is
ELEMENTALS is a family of high-purity, single-element solutions designed to be dosed individually. Instead of a broad-spectrum blend, each bottle targets one parameter so you can raise phosphate without touching potassium, or top up iodine without dosing manganese along for the ride. It's the toolkit for keepers running ICP-based dosing or working with mixed-genera reefs where different corals want different concentrations.
The core macro solutions
These are the workhorses for correcting deficiencies driven by heavy stocking, aggressive nutrient export, or ULNS conditions that have gone too far the other way.
- ELEMENTALS P — Phosphate (1000 ml): For reefs driven too low on PO4, where coral coloration is fading toward pale or brown. Concentrated, dosed sparingly.
- ELEMENTALS N — Nitrogen (1000 ml): A concentrated nitrogen (nitrate) source for tanks running nitrate too close to zero — a common trap in carbon-dosed systems.
- ELEMENTALS KH — Alkalinity (1000 ml): A stabilized multi-carbonate for raising dKH. Cleaner running than straight soda ash, easier to hold a steady line with.
- ELEMENTALS Mg — Magnesium (1000 ml): Concentrated magnesium for correcting the slow decline that comes with heavy calcium and alkalinity dosing.
- ELEMENTALS K — Potassium (1000 ml): Individual potassium dosing, essential for reds and pinks in Acropora and Montipora.
The trace elements — the fine tuning
The Trace series is where ELEMENTALS earns its name. These are the elements ICP tests reveal are missing (or missing in specific ratios), the ones you shouldn't guess at. Each 250 ml bottle is a high-purity single-element solution:
- Trace I — Iodine: For soft corals, LPS coloration, and shrimp molting.
- Trace Mn — Manganese: Supports the enzymes behind zooxanthellae photosynthesis and green coloration.
- Trace Mo — Molybdenum: Key for nitrogen cycling in the tank's bacterial biome.
- Trace Ni — Nickel: Trace-level dosing for one of the more commonly ICP-deficient elements in mature systems.
- Trace Li — Lithium: The classic "missing element" ICP result — now with a clean way to correct it.
Who this is for
If you're running quarterly (or better) ICP tests and reading the results, ELEMENTALS lets you act on them precisely. Instead of dosing a blended trace mix and hoping the ratios match your tank's actual export patterns, you dose the element the test flagged, at the volume the deficit calls for, and re-test.
It's also a strong fit for anyone recovering a system that's been pushed too far — nitrate at zero, phosphate undetectable, coloration turning translucent. The macro solutions in this line let you walk parameters back up in controlled steps rather than triggering an algae bloom with a broad-spectrum shot.
A note on responsible dosing
These are concentrated single-element solutions. Don't dose blind — pull an ICP test, identify the actual deficit, calculate the correction volume against your system's water volume, and split the dose across several days if it's a large correction. The whole point of the line is precision; brute-forcing a correction defeats it.
Browse the full Fauna Marin ELEMENTALS collection or reach out to us at shop@marineconceptsupply.com for dosing guidance on your specific system.
