Neon duels: neon vs black neon and other tetra combinations

Neon vs black neon

Neon tetras have the classic blue stripe and red belly. They’re cheap, widely available, and prone to neon tetra disease when stressed or from weak stock. Black neon tetras are a different species (Hyphessobrycon herbertaxelrodi) — silver with black and white stripes. They’re generally hardier, less affected by neon tetra disease, and slightly larger. Both school well. Black neons tolerate a wider pH range and are often a better choice for beginners or unstable tanks.

Neon vs cardinal

Cardinal tetras look like neons but with a full red stripe from head to tail. They prefer softer, more acidic water and can be trickier in hard tap water. They’re often more expensive. Neons are easier in typical tap water; cardinals shine in blackwater or soft-water setups.

Glowlight tetras

Orange-gold stripe, smaller and more delicate than neons. Peaceful, good in community tanks. They prefer softer water and can be shy in bright, bare tanks. A nice alternative if you want something different from the classic neon look.

Rummynose tetras

Silver body, red nose, black-and-white tail. They are schooling perfectionists — when happy, they hold tight formation. They are more sensitive to water quality; their red noses fade when stressed or in poor water. A good “canary” fish: if rummynose look good, your water is probably fine.

Mixing tetras

You can keep multiple tetra species together if the tank is large enough (e.g. 30+ gallons) and you have at least six of each. Neons and black neons often school together. Cardinals and neons can mix. Avoid pairing very small tetras (e.g. neon, glowlight) with large or nippy fish. Use a stocking calculator to check compatibility and bioload.

Quick takeaways

• Black neons are often hardier than neons; cardinals need softer water.
• Glowlights and rummynose offer different looks and behaviours.
• Mix species in larger tanks with six or more per species.