bio-kalium™

$27.99

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$27.99

Step 4 — Bio-Active Color Elements / Bio-Kalium™ Reef Essential® · Red · Pink Potassium and boron for red and pink corals. Bio-Kalium™ supplies ionic and complexed potassium plus boron — the elements behind red and pink coral pigmentation. Potassium transports nutrients and stabilizes osmotic pressure; combined with boron, it...

Size

250ml
500ml
1000ml
5000ml

Size

Step 4 — Bio-Active Color Elements / Bio-Kalium™

Reef Essential® · Red · Pink

Potassium and boron for red and pink corals.

Bio-Kalium™ supplies ionic and complexed potassium plus boron — the elements behind red and pink coral pigmentation. Potassium transports nutrients and stabilizes osmotic pressure; combined with boron, it promotes strong aragonite formation over brittle calcite. Part of a four-product series that must be dosed together with Bio-Gen, Bio-Metals, and Bio-Enhance.

Target 375–400 ppm potassium Transports nutrients Aids aragonite formation

Open the dosing app

Sizes

250–5000ml

Target

375–400 ppm K

Dose range

0.5–1.0 mL/day per 100L

Use with

Bio-Gen, Bio-Metals, Bio-Enhance

Potassium does more than color

Nutrient transport and aragonite formation

Potassium helps transport nutrients into coral tissue and plays a role in numerous biochemical processes. Combined with boron, it supports the formation of strong aragonite rather than fragile calcite — tying coral color directly to skeletal strength.

Bio-Kalium is one part of a coordinated four-product series. Bio-Enhance, Bio-Metals, and Bio-Gen 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

Deionized water plus potassium and boron.

Use as a team

Must be used alongside Bio-Enhance, Bio-Metals, and Bio-Gen 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 potassium

Keep potassium within 375–400ppm — swings outside this range affect nutrient transport and aragonite formation.

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 potassium by roughly 1.0 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 375–400 ppm potassium

Complete the color series

WHITE · BLUE · VIOLET

Bio-Gen™

Iodide, fluoride, and bromide for white, blue, and violet coral color.

GREEN · YELLOW

Bio-Metals™

Iron and manganese for green and yellow coral color.

BONE GROWTH

Aragonite Enhancers™

CAM parameters for dense, strong coral skeleton.

Questions about this product

Do I need all four products in the series?+

Bio-Gen, Bio-Kalium, Bio-Metals, and Bio-Enhance are formulated to be dosed together, matching the typical uptake ratios in coral. Using just Bio-Kalium will address red and pink color, but leaves the other coloring elements unsupplied.

Does this affect coral bone growth?+

Indirectly — potassium and boron support aragonite formation over brittle calcite. For a dedicated bone-density and growth routine, pair with Step 3's Aragonite Enhancers™.

Can I use this on a dosing pump?+

Yes — this product is safe to use with an automatic dosing pump.

Not sure how much you need?

The dosing app calculates exact amounts for your tank size and potassium reading.