Betta rubra

Betta rubra, the red betta, is a paternal mouthbrooder from peat swamps and forest streams of Aceh Province in northern Sumatra. It is arguably one of the most visually striking wild bettas, with males developing intense crimson-red body colouration overlaid with turquoise-blue iridescent scale edging. The contrast is particularly vivid during spawning season.

This species demands strict water chemistry management: soft, acidic blackwater with pH below 6.5 and minimal hardness is essential. It does not tolerate alkaline or hard water conditions and will decline rapidly in suboptimal environments. Peat filtration, Indian almond leaves, and reverse-osmosis water are strongly advised.

Due to habitat destruction, B. rubra is classified as Vulnerable in the wild. Captive breeding efforts by enthusiasts play an important conservation role. Spawning is moderately challenging but achievable for dedicated intermediate-to-advanced keepers, with broods of 10–25 fry.