Fish

Practical, hands-on fish advice, organised by what you are actually trying to sort out.

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Latest in Fish

Behaviour

Why are my fish fighting

Fish aggression is usually not bad luck but a predictable result of the wrong mix, too little space, or too few of a schooling species. Here is how to work out the cause and calm the tank.

Daniel Okafor

Breeds

How big a tank does your fish really need

The tank sizes sold for popular fish are often far too small, and it is a leading cause of sick, stunted, short-lived fish. Here is how to think about tank size honestly.

Daniel Okafor

Health

Water changes and testing, explained simply

The two habits that keep a tank healthy are the two beginners most often skip. Here is how to do regular water changes and testing properly, and why they matter more than anything else.

Daniel Okafor

Behaviour

The signs your fish is stressed

Fish cannot yelp or hide under the bed, but they show stress clearly once you know what to look for. Here are the signs, and what they are usually telling you.

Daniel Okafor