Korallen-Zucht Magnesium Complex Concentrate – 1000 ml

This Magnesium Complex from Korallen-Zucht supplies a key element for stony corals and calcareous algae, keeping levels in the optimal reef range.

Important element for stony corals and calcareous algae.

Recommended in any tank system. Optimum level of 1200 – 1280 mg/L.

Dosing: 3 ml per 200 litres per day, or according to what your tank consumes. That is Korallen-Zucht's own figure for the Magnesium Complex Concentrate, from their 2018 Easy Reefing guide. The 3 ml per 1,000 litres daily sometimes quoted here is the rate for their trace element and strontium concentrates; magnesium is consumed in far larger quantities, which is why its figure is the higher one. Test magnesium regularly and dose to consumption.

Compatibility

What it is. KZ's dosing guide: an important element for stony corals and calcareous algae. This is the liquid magnesium supplement, as distinct from ZEOmag, which is the granulate for calcium reactors.

Where this sits in the Korallen-Zucht range. KZ build everything around four basis products — ZEOvit zeolite media, ZEObak, ZEOfood and ZEOstart — which together are the ZEOvit system. Everything else in the range, this product included, is a layer on top: colour products, problem solvers, and single elements. KZ's own guidance is that the products can each be used separately, without the complete ZEOvit system and without the other KZ products, but that the full effect in quality and colouration comes only from running the system.

If you run a calcium reactor, ZEOmag Magnesium Granulate does the same job inside the reactor and is the more usual route.

No ozone and no UV while you are running the ZEOvit system. That is KZ's instruction, and the reason is the point of the system: ozone and UV destroy the microorganisms and elements the whole method depends on.

KZ's own target water parameters, for any tank running their products: calcium 400–410 mg/L, magnesium 1,260–1,280 mg/L, carbonate hardness 6.5–8, potassium 380–400 mg/L, salinity 33–35 ppt. They add a warning worth repeating: higher figures bring no advantage. Neither growth nor colouration in SPS corals is improved by pushing past these, and higher levels tend to have negative effects.

Freshness & Storage

Every batch we dispatch carries a minimum of 6 months' remaining shelf life. Store this product in a cool, dry place away from direct sunlight, with the cap or inner foil closed tightly after each use.

Backorder & Dispatch Timeline

This item is stocked to order. Back-orders are consolidated and placed with our overseas suppliers once a month, on the last day of the month, and all such orders are shipped before the 15th of the following month.

Back-orders cannot be cancelled once they have been placed with the supplier. If you cancel before that, payment-gateway charges of 2% plus GST are deducted and the balance refunded. In the rare case a supplier cannot fulfil the item, we will offer you an alternative first, and refund in full with no deduction if you would rather not take it.

Returns & Replacement

Returns are accepted within 7 days of delivery, provided the item is unused and in its original packaging. Manufacturer-sealed items cannot be returned once the seal is broken, and sale-priced items are not refundable.

If your item arrives defective or damaged, message us on WhatsApp with your order number — or email us, if you would rather — and we will replace it. Approved replacements are delivered within 3 to 5 business days. Transit damage is covered by insurance on every shipment. If tracking shows delivered but nothing reached you, tell us within 72 hours, which is the reporting window Indian couriers allow. Damage caused during installation or use is not covered; replacement spares for such cases are chargeable.

Full terms are on our Cancellation & Returns page.