Pyramid Top Snail
Tectus fenestratus
Also known as Tectus Snail, Fenestrate Top Shell, Grazer Shell, False Trochus Snail, Latticed Top Shell
Care at a glance
- Temperature
- 75–81°F (24–27°C)
- pH
- 8.1–8.4
- Adult size
- 2 in (5 cm)
- Minimum tank
- 11 gal (40 L)
- Temperament
- Peaceful
- Social behavior
- Social
- Swim level
- Bottom
- Difficulty
- Beginner
- Breeding
- No record
- Rarity
- Common
- Reef safe
- Reef safe
- Origin
- Indo-Pacific, grazing rock and rubble on shallow reef flats.
- Family
- Tegulidae
Overview
Add one or a few to a tank of 40 litres or more at 24 to 27 C and pH 8.1 to 8.4 with mature rock and algae to graze. It eats diatoms, film algae, hair algae, and some cyanobacteria off hard surfaces and is completely reef safe. In a very clean tank it can run short of food, so offer dried algae if the rock looks bare.
In the wild
The pyramid top snail has a tall, cone-shaped shell with a flat base, often patched with algae that helps it blend into the rock. It is a tough, no-nonsense grazer that works the rock, glass, and sand for algae. The shell reaches around 5 cm at full size.
Good to know
Tectus fenestratus belongs to the top shell family Tegulidae and is closely related to the trochus snails sold for the same cleanup job. It grazes mostly at night and can usually right itself if it tips over, unlike many turbo snails.
Did you know
Unlike many turbo snails, which can die stranded on their backs, it can usually flip itself upright if it lands on its shell.
Where to buy
Some links may not be the exact species or variety.
…or ask your local fish store.
Appears in
Keeping Pyramid Top Snail?
Track water tests, reminders and stocking fit.
Related species

Mexican Turbo Snail
Turbo fluctuosus2.4 in (6 cm)11 gal (40 L)75–81°F (24–27°C)
Cerith Snail
Cerithium sp.1.6 in (4 cm)11 gal (40 L)72–79°F (22–26°C)
Tiger / Strawberry Conch
Conomurex luhuanus2.8 in (7 cm)20 gal (75 L)75–81°F (24–27°C)
Fighting Conch
Strombus alatus3.1 in (8 cm)20 gal (75 L)75–81°F (24–27°C)
Ring Cowrie
Monetaria annulus1.2 in (3 cm)20 gal (75 L)75–81°F (24–27°C)Trochus Snail
Trochus sp.1.2 in (3 cm)11 gal (40 L)72–79°F (22–26°C)
