Red Onion Nerite Snail

Description

Red Onion Nerite Snail (Neritina sp.)

The Red Onion Nerite Snail is a striking and highly effective freshwater algae eater, prized for its bold, rounded shell pattern and excellent tank-cleaning abilities. With its deep reddish-brown “onion-like” shell markings and compact, dome-shaped body, this Nerite variety adds both function and subtle beauty to planted aquariums and aquascapes.

Native to brackish and freshwater-influenced environments in coastal regions, Nerite snails are well known for their ability to thrive in aquariums while not overpopulating, as they cannot reproduce in freshwater. This makes them one of the safest and most reliable invertebrates for algae control in community tanks.

The Red Onion Nerite is especially valued for its ability to graze on stubborn algae types, including green spot algae and biofilm, helping keep glass, décor, and hardscape clean without damaging live plants.

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Why You’ll Love the Red Onion Nerite Snail

• Excellent natural algae control for glass, rocks, and décor
• Attractive red-brown patterned “onion” shell
• Completely reef and plant safe (does not eat healthy plants)
• Cannot breed in freshwater (no population control issues)
• Peaceful and easy to care for

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Appearance & Behaviour

Red Onion Nerite Snails typically grow to around 2–3 cm. Their shells are rounded and slightly domed, featuring rich red, brown, and dark patterned markings that resemble layered onion skin—hence the name.

They are slow-moving, methodical grazers, spending most of their time gliding across surfaces in search of algae and biofilm. Unlike many pest snails, they are non-invasive and highly beneficial to aquarium cleanliness.

They may occasionally climb above the waterline, which is normal behaviour and should not be a cause for concern as long as the tank has a lid.

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Tank Requirements & Care

Red Onion Nerite Snails are extremely hardy and adaptable, making them suitable for most freshwater aquariums.

Tank Size:
Suitable for 30 litres and up

Water Parameters:

• Temperature: 22–28°C
• pH: 7.0–8.5
• Hard water preferred (supports shell health)

Environment:

• Glass surfaces, rocks, and driftwood for grazing
• Planted aquariums or aquascapes
• Stable, well-cycled water conditions
• Secure lid (they may explore above waterline)

They are sensitive to copper-based medications, which should be avoided.

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Feeding

Red Onion Nerite Snails are primarily algae grazers, feeding on:

• Green spot algae
• Brown diatoms
• Biofilm on glass and décor
• Leftover organic waste

In very clean aquariums, supplement their diet with:

• Algae wafers
• Blanched vegetables (zucchini, spinach)

They should always have access to natural grazing surfaces.

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Tankmates & Compatibility

Red Onion Nerite Snails are completely peaceful and compatible with virtually all community aquarium inhabitants.

Compatible tankmates:

• Tetras, rasboras, and livebearers
• Corydoras and other peaceful bottom dwellers
• Shrimp species (Amano, Cherry, etc.)
• Gouramis and peaceful cichlids
• Most reef-safe freshwater setups

Avoid:

• Large snail-eating fish (e.g. puffers, some loaches)
• Aggressive cichlids that may nip or dislodge them

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Quick Facts

• Common Name: Red Onion Nerite Snail
• Scientific Name: Neritina sp.
• Adult Size: 2–3 cm
• Temperament: Peaceful
• Care Level: Easy
• Diet: Algae grazer
• Water Type: Freshwater (can tolerate brackish origins)
• Reproduction: Cannot breed in freshwater

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✨ The Red Onion Nerite Snail is a perfect addition to any freshwater aquarium, offering reliable algae control, zero breeding issues, and a uniquely patterned shell that adds subtle natural beauty to aquascapes.