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We've published our most detailed technical guide yet: a full UK cycling walkthrough that goes well beyond the 600-word summaries you'll find elsewhere.

**Inside the guide:**

- What ammonia, nitrite and nitrate should read at **each week** of a fishless cycle
- Why UK tap water's pH and hardness affects free-ammonia toxicity
- Which liquid test kits are worth buying (and the one mistake that makes the API Nitrate kit lie to you)
- How to troubleshoot a stall — temperature, chloramine, surfactant contamination, media choice
- Nitrate limits by species, including the tight tolerances needed by Arowana, Datnoid and wild-caught Corydoras

Once your cycle is confirmed, the fish worth waiting for are here.

![Black Arowana (Osteoglossum ferreirai) — in stock now, from £250](https://mtf-aquatics.co.uk/wp-content/uploads/2026/02/WhatsApp-Image-2026-02-14-at-14.00.41.jpeg)

Black Arowana (*Osteoglossum ferreirai*) — 12–13", hand-selected, Live Arrival Guarantee. **2 in stock from £250.**

[Read the full cycling guide →](https://mtf-aquatics.co.uk/complete-uk-guide-cycling-freshwater-aquarium-nitrogen-cycle)