Black Racer Nerite Snail
Glossy jet-black shell, relentless algae appetite.
The largest and fastest of the common nerites — a solid black, high-gloss shell over a striking foot, and the appetite to match. Black racers clear green spot and diatom algae from glass, rock, and hardscape faster than any other snail we keep, and they never touch healthy plants.
Photo: Foto: Llez, CC BY-SA 3.0, via Wikimedia Commons
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What it needs to thrive
- Lighting
- Any — a little algae growth on glass and hardscape keeps them grazing.
- Flow
- Low to moderate. A tight-fitting lid or lower waterline keeps wanderers in the tank.
- Feeding
- Algae and biofilm grazers. Supplement with algae wafers or blanched zucchini in clean, low-algae aquariums.
- Temperament
- Completely peaceful and plant-safe. Copper-sensitive — never dose copper medications.
- Difficulty
- Beginner
- Ideal Tank Size
- 5 gallons and up per snail, fully cycled.
- Water Parameters
- 72–80°F · pH 7.0–8.2 · GH 6–12 · KH 3–8 · copper-free · calcium-rich water for shell health
Glass, hardscape, and driftwood. One snail per 5–10 gallons is plenty in an established tank.
Completely peaceful and plant-safe. Cannot reproduce in freshwater, so populations never explode.
Quarantine, dip, and acclimation
Quarantine
Hold all new fish in a bare-bottom 10–20 gallon QT for a minimum of 4 weeks. Observe for flashing, clamped fins, white spots, or breathing changes. Treat preventatively with copper (1.75–2.5 ppm chelated) or tank-transfer method for ich, plus a praziquantel course for flukes. Invertebrates and corals skip QT but go through dip and observation instead.
Recommended coral dip
For every new coral: a 5–10 minute bath in your reef-safe dip of choice (Bayer Complete, CoralRx, or Reef Primer) following label dosage, followed by two clean saltwater rinses. Inspect plugs and bases for flatworms, pyramid snails, and eggs — remove or refrag onto clean plugs before placing in display.
Acclimation
Float sealed bags in your QT or display for 15 minutes to match temperature. Then drip acclimate at 2–4 drops per second for 45–60 minutes until volume has tripled. Net livestock into the tank — never pour shipping water in. Dim the lights for the first 24 hours to reduce stress.
