Step 4 — Bio-Active Color Elements / Bio-Metals™
Reef Essential® · Green · Yellow
Bioactive metals for green and yellow corals.
Bio-Metals™ supplies ionic, complexed, and chelated iron plus manganese — the elements behind green and yellow coral pigmentation. The ionic and complexed forms are immediately bioavailable; the chelated form delivers a sustained release. Part of a four-product series that must be dosed together with Bio-Gen, Bio-Kalium, and Bio-Enhance.
Iron is a balancing act
Too little iron and green corals turn pale and dull. Too much, and you risk algae issues — including the kind of blooms that get out of hand fast. Bio-Metals is designed to hold iron in a tight, safe range: ionic and complexed metals are immediately bioavailable, while the chelated portion provides a steady, ongoing supply so you're not constantly re-dosing.
Bio-Metals is one part of a coordinated four-product series. Bio-Enhance, Bio-Gen, and Bio-Kalium round out the required biomolecules and major, minor, and trace coloring elements — using just one leaves the others under-supplied.
What's in the bottle
Contents
Deionized water plus bioactive metals (iron, manganese, and trace metals).
Use as a team
Must be used alongside Bio-Enhance, Bio-Gen, and Bio-Kalium for the full coloring element profile.
Directions
Shaking isn't required, though inverting 3–4 times helps if it's been sitting a while. Add to high water flow; safe on a dosing pump.
Reef aquariums only
Formulated for reef tanks with coral, not general saltwater setups.
Monitor iron closely
Keep iron within 0.1–0.3ppm. This is a narrower margin than most Step 4 elements — excess iron is a common driver of unwanted algae.
Want stronger bone growth too?
Pair with Step 3's Aragonite Enhancers™ for coral bone density and growth alongside color.
Dosing guide
1 mL/100L (26 gal) raises iron by roughly 0.01 ppm; boron increases relatively.
| Stocking level | Dose |
|---|---|
| Lightly stocked | 0.50 mL/day per 100L (26 gal) |
| Moderately stocked | 0.75 mL/day per 100L (26 gal) |
| Heavily stocked | 1.00 mL/day per 100L (26 gal) |
| Or as required | to maintain 0.1–0.3 ppm iron |
Questions about this product
Do I need all four products in the series?+
Why does iron need tighter control than other elements?+
Can I use this on a dosing pump?+
Not sure how much you need?
The dosing app calculates exact amounts for your tank size and iron reading.
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