Korallen-Zucht ZEOmag Magnesium Granulate – 5 kg

This pure magnesium granulate from Korallen-Zucht raises magnesium levels in a calcium reactor without adding chloride or sulphate.

Korallen-Zucht ZEOmag is a pure magnesium granulate for calcium reactors, used to correct magnesium alongside calcium and KH — the three parameters that keep each other stable in a reef tank (see our guide to Calcium & Magnesium). Part of the Marine Aquarium Water Conditioner range at IndieFur.

ZEOmag is a pure magnesium granualte. Mix with the coral gravel media at a rate of 5 – 15 % and fill into the calcium reactor.

Increases magnesium without chloride sulphate. Recommended in any tank system.

Coarse grain of 6 – 12 mm.

Compatibility

What it is. Magnesium granulate for a calcium reactor. KZ's dosing guide: increases the magnesium level specifically, a natural medium for calcium reactors, free of nitrate and phosphate. Bulk Reef Supply add the practical point — it is one of very few ways of holding magnesium up without adding chloride or sulphate with it.

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.

ZEOca Calcium Plus Granulate is the matching product for calcium; the two are mixed into reactor media the same way.

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.

Dosage & Directions

Korallen-Zucht's own dose. KZ's own figure is a supplement of 5 to 10% by volume, added to the calcium reactor media. Bulk Reef Supply run it higher, at 10 to 30% of the mix, which is their practice rather than KZ's published figure. Adjust to your own magnesium level and consumption, and test regularly.

How and where it goes in. Mixed in with the standard calcium carbonate media in the reactor. Bulk Reef Supply publish the grain size as 6 to 12 mm.

Start below the figure, not at it. KZ's own instruction for a first-time user, a lightly stocked tank, or a tank with little growth: reduce the dosage recommendation and adjust upward. Their words — do not act on the principle that the more the merrier.

Calculate on gross volume. KZ ask you to use the gross water amount for dosing arithmetic, not a net figure with rock and sand deducted.

Pack Size

This listing is the 5 kg pack.

We stock it in 1 kg and 5 kg. The contents are identical; only the bottle changes. If you are dosing a large system daily, the larger packs are the ones to ask about.

Buy the size you will actually get through. These are concentrated additives dosed in millilitres and drops. A 5-litre container on a nano tank is not a saving; it is a bottle that will outlive its usefulness on the shelf.

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.