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Most disease outbreaks in established tanks trace back to one thing: a fish added without quarantine.

We've put together a practical guide covering the four diseases UK hobbyists encounter most — **white spot, velvet, fin rot, and dropsy** — with identification signs, treatment frameworks, and a species-sensitivity table that matters if you're keeping stingrays, Bichir, or L-number Plecos.

![Black Arowana (Osteoglossum ferreirai) — early disease identification is critical in large specimen fish](https://mtf-aquatics.co.uk/wp-content/uploads/2026/02/WhatsApp-Image-2026-02-14-at-14.00.41.jpeg)

Key things the guide covers:

- Why velvet kills faster than ich — and how to tell them apart with a torch
- Copper is lethal to stingrays at therapeutic doses — what to use instead
- When dropsy is worth treating and when to call a fish vet
- Minimum QT spec and exactly how long to hold new arrivals

Every fish we ship has been health-checked and confirmed feeding. Your quarantine tank is what takes it from there.

[Read the full guide →](https://mtf-aquatics.co.uk/mtf-blogs/)