How to set up a blackwater betta fish tank

Blackwater tanks replicate bettas’ natural habitat—warm, tannin-rich, plant-littered pools.
Use Indian almond leaves, driftwood, and botanicals like catappa bark and alder cones.
Keep lighting low and water between 78–82°F.
Use dark substrate and floating plants for shade.
Maintain pH between 6.5–6.8 and soft water (GH 4–8).
No strong filtration—use sponge filters.
Blackwater promotes healing, reduces stress, and enhances colors.