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If a fish in your tank started scratching against the substrate today, would you know what you were dealing with within the hour?

We've put together a no-filler guide to the four diseases that cause the majority of UK tropical fish losses: **whitespot (ich)**, **velvet**, **fin rot**, and **columnaris** — covering what each one actually looks like, why it happens, and how to respond.

There's also a full quarantine protocol section, because keeping disease out of your display in the first place is worth far more than any treatment.

![Snow White Pearl Stingray (Male, 11-12") — one of the hand-selected specimens currently in stock at MTF Aquatics](https://mtf-aquatics.co.uk/wp-content/uploads/2026/01/Male_Snow_White.jpeg)

While you're here — we currently have hand-selected, health-checked tropical fish in stock, every one shipped with our Live Arrival Guarantee.

**[Read the disease guide →](https://mtf-aquatics.co.uk/help-guides/tropical-fish-diseases-ich-fin-rot-velvet-columnaris-uk)**

**[Browse current stock →](https://mtf-aquatics.co.uk/shop/tropical-fish-online/)**

We're fishkeepers first. — Marc & the MTF team