Fish

Responsible fishkeeping decisions

Profiles built around adult size, behaviour, social needs and usable space.

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Find a compatibility zone

Two fish share a system only when habitat, water parameters and behaviour overlap.

Habitat · parameters · behaviour

What you will find

Temperate and tropical fish
Compatibility beyond water values
Welfare before stocking density

1 guide

Coldwater aquariums

Fish care and welfare

Coldwater aquariums: choose for the whole year

Plan an unheated aquarium from measured summer and winter temperatures, oxygen margin, adult size and social needs instead of treating “coldwater fish” as one compatible group.

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Compatibility

Fish care and welfare

Compatible tropical fish: build a community brief

Use species records, adult groups, water, predation, territory, feeding and tank footprint to reject unsafe combinations and design a community that can be observed and maintained.

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Welfare and behaviour

Fish care and welfare

Fish gasping or distressed: first-response protocol

A calm first-response method for gasping, rapid breathing, loss of balance, hiding or appetite loss: make the system safe, record the pattern, test decisive variables and know when to seek help.

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