Neon Tetra
Paracheirodon innesi
Min Tank Size
40L
Adult Size
4 cm
Lifespan
5 years
School Size
6+
About
Few fish are as instantly recognizable as the neon tetra. Native to the blackwater and clearwater streams of the Amazon basin in South America, these little fish have been captivating hobbyists since the 1930s and remain one of the best-selling aquarium fish in the world for good reason.
That iridescent blue stripe running from nose to tail, paired with a vivid red stripe from mid-body to the caudal fin, makes them look almost unreal under aquarium lighting. When a healthy school catches the light together, it's genuinely hard to look away. They top out around 4 centimeters, making them a true nano fish suitable for smaller community setups.
Water quality matters a lot with neons. 0. Temperature should stay on the cooler end of tropical, around 22 to 25 degrees Celsius being the sweet spot. They're not picky eaters and will readily accept quality flake or micro pellet food, but they appreciate variety including frozen or live foods like daphnia and baby brine shrimp. Feeding small amounts twice a day keeps them in great condition.
These fish are best kept in schools of at least six, though more always looks better and reduces stress noticeably. A planted tank suits them perfectly, giving them cover and bringing out their colors against a dark background. Browse some real community tank builds featuring neon tetras to see just how much a large school transforms an aquascape.
Water Parameters
Temperature
°CpH
GH
dGHKH
dKHSwimming Level
Flow Preference
Keeping multiple Neon Tetra together
Neon Tetra are shoaling fish and need company of their own kind. Keep a group of at least 6. Smaller groups leave them stressed, washed-out in color, and prone to hiding.
Compatibility
Neon tetras are one of the easiest fish to find tankmates for. They pair beautifully with other small peaceful schoolers like ember tetras, harlequin rasboras, and celestial pearl danios. Corydoras catfish make excellent bottom-dwelling companions since both share similar water parameter preferences. Avoid anything large enough to eat them, including angelfish, which is a surprisingly common beginner mistake since the two species prefer overlapping water conditions but angels will absolutely eat adult neons. Bettas are a gamble that sometimes works and sometimes doesn't. Dwarf gouramis generally coexist fine. Large or boisterous fish will stress them, so keep tankmates similarly sized and calm.
Commonly kept with
Species this one is most often paired withCommonly tried but avoid
Often paired, but shouldn't beCare Notes
The most common beginner mistake is adding neon tetras to a tank that hasn't fully cycled. They are sensitive to ammonia and nitrite spikes in ways that tougher fish like danios can shrug off, and losses in a new tank are almost always water quality related. A second major issue is temperature creep. Many people keep them too warm, which shortens their lifespan and makes them more susceptible to disease. Keep it under 26 degrees Celsius. Neon Tetra Disease, caused by a microsporidian parasite, is incurable and spreads fast, so quarantining new arrivals before adding them to a display tank is genuinely important here.
Behavior & Aggression
Neon tetras are about as peaceful as fish get in most situations. Genuine aggression toward other species is rare and typically not a concern. The one behavior worth watching is mild fin nipping, which tends to emerge when the school is too small, the fish are stressed, or they're kept in an overcrowded or understimulating environment. A well-fed school of eight or more in a planted tank rarely shows any nipping behavior at all. They do not establish territories and pose no meaningful threat to any tankmate too large to be mistaken for food.
Things to Know
- Very sensitive to new tank syndrome, never add to uncycled tanks
- Neon Tetra Disease has no cure, quarantine all new fish
- Small school size increases stress and erratic behavior
- May pick at dwarf shrimp, especially juveniles
- Must be kept in schools of 6+, will be stressed otherwise.
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