Botanicals & Blackwater

A blackwater aquarium mimics the tannin-rich waters of tropical forests. Leaves, driftwood, and other botanicals release tannins that tint the water amber or brown, soften it, and lower pH. Many fish, including bettas and some shrimp species, evolved in these conditions and thrive in them.

Start with 1 leaf per 10 gallons. Break the leaf into pieces to speed up tannin release. The water will turn amber over 24-48 hours. Remove old leaf matter after 2-3 weeks before it breaks down completely. For stronger tinting, increase to 1 leaf per 5 gallons.

Yes. Catappa leaves and Indian almond leaves are the same product from the Terminalia catappa tree. "Catappa" is the scientific name; "Indian almond" is the common name. Some sellers use "ketapang leaves," which are also the same species.