Spiny Astrea Snail
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Specific Name: Lithopoma tectum (formerly often listed under Astraea phoebia)
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Diet: Herbivore – grazes on diatoms, film algae, and green hair algae
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Pest or Good Guy: ✅ Good Guy
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Size: 2.5–4 cm
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Breed in Captivity: No
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Cautions: Cannot right themselves if they fall; their jagged shells can trap detritus or irritate delicate corals if they crawl over them
Description:
Spiny Astrea snails are a tougher, edgier-looking cousin of the common Astrea, instantly recognizable by their rugged, pointed shell spines. These slow-moving algae grazers are great at keeping rockwork and glass free from film and early-stage algae growth, though they tend to avoid sand. While hardy and peaceful, they share a frustrating trait with their smooth-shelled relatives: if they fall upside-down, they can’t right themselves and will die without help. Their spiky shells offer a unique look and even deter some predators, but they can snag on corals or structures if not given room to roam. A cool-looking clean-up crew member best kept in tanks where you can spot them easily and give a helping hand if needed.