Java Moss
Cheap, grows densely, shelters eggs from parents and spores.
Dark green color helps eggs stay camouflaged.
Downside: snails and pests hide in moss and can be hard to clean.
Synthetic Spawning Mops
Acrylic yarn tied to a cork top — floats. Or weighted to sink.
Dark green color preferred.
Sterilize in boiling water between spawns.
Willow Moss and Christmas Moss
Same uses as java moss but grows slower and stays tidier.
Slightly higher cost but better for show-quality fry tanks.
Best Plant per Species
Bettas: floating plants like frogbit for nest anchor.
Tetras: java moss clumps on substrate.
Killifish: floating yarn mops.
Rainbowfish: sinking yarn mops.