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Aggressive & semi-aggressive fish

32 species are rated aggressive or semi-aggressive.

These species carry an aggressive or semi-aggressive flag. They need volume above their listed minimum, plant cover or rockwork that breaks line of sight, and a stocking plan that often comes down to one species per tank. The order you add fish matters too: an established cichlid will defend its half of a tank against any newcomer, regardless of size or temperament label on the newcomer's profile.

These species need volume above the listed minimum, real breaks in line of sight, and almost always a stocking plan with one centrepiece species and a few peripheral peacekeepers. The order you add them in matters as much as the litres. Established residents will defend territory against any new addition, so rearranging decor and quarantining newcomers are part of the routine, not an emergency response.

Every row is a real profile in the live library; filters are field-driven, not hand-curated blurbs.

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