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Bubble Algae
Valonia ventricosa
Family: Valoniaceae
📍 Worldwide tropical reefs
Iridescent green spheres that appear harmless in small numbers but rapidly colonise rock if left unchecked. Emerald crabs are the most effective biological control. Do not pop bubbles — they release spores and worsen the outbreak. Manual removal requires extracting the entire holdfast; even fragments regrow.
Keeping this species
- role
- nuisance
- control
- Emerald Crab, manual removal (do not pop), reduce phosphate
- warning
- do not crush or cut — releases spores
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Natural Habitat Temperature
79°F — 81°F seasonal range · (Jan low, Apr high)