Hemigrammus bleheri
One of the tightest-schooling tetras — a group moves as one. The bright red nose doubles as a water-quality indicator: it fades when something is off. Keep eight or more at 24–28 °C in a planted tank of 80 litres or more.
Sample photo: “Petitella bleheri (Hemigrammus bleheri - 2)” by Soulkeeper, CC BY-SA 3.0, via Wikimedia Commons. Sample photo: “Petitella bleheri (Hemigrammus bleheri)” by Soulkeeper, CC BY-SA 3.0, via Wikimedia Commons. Sample photo: “Petitella bleheri (Hemigrammus bleheri - 3)” by Soulkeeper, CC BY-SA 3.0, via Wikimedia Commons.
Tight schooler; the red nose fades when water quality slips — a useful early warning.
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