Korallen-Zucht ZEObak – 100 ml

ZEObak by Korallen-Zucht introduces multiple beneficial bacterial strains to build a healthy, efficient bacterial fauna in reef tanks.

The essential microorganism solution for a healthy, well-balanced and efficient bacterial fauna in a tank. ZEObak contains several bacterial strains  building up bacteria plankton (also in combination with ZEOfood and ZEOstart). Bacteria plankton is absorbed by many corals.

The Probiotic Method.

It's a simple method of obtaining a low nutrient environment in your reef aquarium with a tiny addition of special bacteria.

These bacteria consume nitrate and phosphate from the aquarium water, managing the levels in your aquarium and locking those nutrients up into biomass and bacterioplankton.

The bacterioplankton is a highly nutritious and natural source of food for your corals and can be removed via efficient protein skimming. It is scalable and can be tailored to your specific aquarium based on the desired level of nutrients available in the water.

Dose: 1 drop per 25 gallons/100 L once or twice a week, depending on tank stocking. Dose directly into the tank.

ZEObak shelf life 3 years.

Part of managing nitrate and phosphate levels — see our guide to Nitrate & Phosphate for why these two parameters are tracked together.

Compatibility

What it is. A microorganism solution. KZ's catalogue calls it a high-tech bacterial solution that creates a healthy, well-balanced and efficient bacterial fauna and reduces organic and inorganic substances.

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.

One of the four basis products — ZEOvit, ZEObak, ZEOfood, ZEOstart. KZ say an efficient biology is established in a short time when ZEObak is used together with ZEOstart and/or ZEOfood.

KZ mix ZEObak with Coral Snow to deal with slime algae. Bulk Reef Supply, who carry the line, put a figure on it: one drop of ZEObak per 25 US gallons added to Coral Snow, dosed every two days until the cyanobacteria are gone.

Dose it on a different day from the iodide concentrates, CyanoClean and Bio-Mate — that is KZ's instruction on the iodide products.

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.

Pack Size

This listing is the 100 ml pack.

We stock it in 50 ml and 100 ml. 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.

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.