Korallen-Zucht Resistant Fish Concentrate – 250 ml

Resistant Fish Concentrate from Korallen-Zucht treats abscesses, wounds, and parasitic infestations in fish with a targeted dosing protocol.

Fish with abscesses, wounds, mucous damages and other injuries as well as parasitical infestation:

• Separate fish for treatment. Dose Resistant Fish 1-2 closing caps per 5 liters (according to heaviness of infestation), bath about 15-20 minutes. Then place fish back into the tank. Repeat if necessary.
• Impedes the growth of protozoa, nuisance algae, fungus and parasites.
• Strengthens the immune system and improves growth in fish.
• Will bind inorganic compounds such as heavy metals.
• Will also bind organic contaminants such as microbials and decaying matter, e.g. Parasites, algae, bacteria, fungus, bird, fish, snail and worm excrement, rotting food and plant matter.
• Mucous membranes and gills are protected from ectoparasites and fungus due to the light coating effect.
• Supports recovery and healing of skin lesions and wounds through the anti-inflammatory properties of the ingredients.

Will increase the growth of water plants as a side-effect of the above processes.

Compatibility

What it is. A bath treatment for fish. KZ's dosing guide names the cases: fish with illness, abscesses, wounds, mucous membrane damage and other injuries, or parasitic infestation.

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.

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 250 ml pack.

We stock it in 250 ml, 500 ml and 5000 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.

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.