Betta pi

The dark throat marking resembles the Greek letter π, with black lower gill covers.

The dark throat marking resembles the Greek letter π, with black lower gill covers. Both sexes have a broad blue anal-fin margin; the dorsal and caudal fins lack crossbars.

Adult length

Up to 9 cm (standard length, without the tail fin)

Water temperature

22–28 °C

pH

4–6.5

Hardness

1–5 dGH

Natural habitat

Inhabits shaded peat-swamp blackwaters and their outflowing creeks, with dense leaves, roots and vegetation.

Prefers acidic water with low hardness. Throat markings are more useful than trade names for telling relatives in the waseri group apart.