Dr. Moss Catappa Leaves - Indian Almond Leaves Medium Catappa 10-15cm for Betta Fish & Shrimps ORGANIC, MINI CATAPPA LEAVES --- SunGrow Mini Catappa leaves are hand picked just before they fall. HAVE A BREEDING FISH? ADD CATAPPA --- The tropical fishes create bubble nest using a floating leaf or plant to anchor their bubbles. NATURAL HOMELY ENVIRONMENT FOR FISH --- Blackwater, or tannin-rich water has many great benefits for fishes like tetra, discus, and goldfish. It may turn the water black initially, but gives natural water condition to them. The Catappa leaves are organic so you know what goes into your tank. Simply drop a few leaves into the water and youll notice the water turning brown (or yellow) in just a few hours. Remove only when the leaves start to disintegrate. Always rinse before use, even after boiling or soaking. By the way, a "post-boil soak" in fresh water with a bag of activated carbon is a recommended step too.