Neon Tetra Care Guide: Small Fish, Big Personality

Where do you even start with Neon Tetras?

If you've ever walked past a tank full of Neon Tetras and thought "I want that" — you're not alone. That electric blue stripe with the red tail is one of the most recognisable sights in the hobby, and for good reason. They're stunning, they're peaceful, and they're genuinely one of the best fish you can keep in a community tank.

They're also one of the most popular fish in the world, which means there's a lot of information out there — some of it good, some of it not so much. This guide covers what you actually need to know to keep them happy and healthy.

A bit of background

Neon Tetras (Paracheirodon innesi) come from the blackwater rivers of South America — the Amazon basin, mostly. In the wild they live in huge shoals in soft, acidic, dimly lit water under a dense forest canopy. That tells you quite a lot about what they prefer in a tank.

They're small — usually around 3–4cm fully grown — but what they lack in size they more than make up for in impact. A shoal of 15 or 20 Neon Tetras moving together is genuinely one of the most beautiful things you can have in a home aquarium. They're schooling fish, so the more the merrier. Don't be tempted to just get 4 or 5 — they'll be stressed and won't shoal properly. Aim for at least 8–10 as a minimum.

Tank setup

Tank size

A 60-litre tank is a reasonable minimum for a small shoal, though bigger is always better. Neon Tetras are active swimmers and appreciate space to move around. They also do best in an established tank — don't add them to a brand new setup that hasn't cycled yet. They're not the hardiest fish and a tank that's still cycling will stress them out quickly.

Water parameters

  • Temperature: 20–26°C — they prefer the cooler end of tropical
  • pH: 6.0–7.0 — slightly acidic is ideal, though they'll tolerate up to 7.5
  • Hardness: Soft to moderately hard — they come from soft blackwater rivers, so very hard water isn't ideal
  • Ammonia/Nitrite: Zero. Always. They're sensitive to water quality, so regular water changes are non-negotiable.

Keep the water clean and stable and they'll thrive. Let it slip and you'll know about it pretty quickly. You could say they're the canary in the coal mine of your tank — if the Neons look off, something's usually up with the water. 🐟

Lighting and decor

Neon Tetras come from shaded forest rivers, so they appreciate a tank that isn't blasted with light. Subdued lighting, plenty of plants, and some driftwood to break up the space will make them feel right at home — and honestly, they look even more stunning under softer light. That blue stripe really pops.

Dense planting is a big plus. Java Moss in particular is brilliant with Neon Tetras — they love darting in and out of it, and it gives them somewhere to retreat to if they feel nervous. Our Java Moss Care Guide has everything you need to get started with that.

Feeding

Neon Tetras are not fussy eaters, which is a relief. They'll happily take:

  • Good quality micro pellets or flake food as a staple
  • Frozen or live daphnia, bloodworm, and brine shrimp as treats
  • Micro worms if you want to go full aquarist mode

Feed small amounts once or twice a day — only what they can eat in a couple of minutes. Overfeeding is one of the most common mistakes in fishkeeping and it'll foul your water fast. Little and often is the way to go.

Tank mates

Neon Tetras are peaceful community fish and get along with most things that won't fit them in their mouth. Good tank mates include:

  • Other small tetras — Cardinal Tetras and Black Neon Tetras mix brilliantly with them and create a stunning multi-species shoal
  • Corydoras — peaceful bottom dwellers that won't bother them at all
  • Small rasboras — similar size and temperament
  • Cherry and Amano Shrimp — generally fine together, though very tiny shrimp fry may occasionally get eaten
  • Dwarf Gouramis — usually peaceful, though keep an eye on them
  • Otocinclus catfish — great algae eaters that won't cause any trouble

Avoid anything large or nippy — Angelfish are a classic mistake. They look beautiful together in photos but in practice, Angels will eat Neon Tetras. Tiger Barbs are another one to avoid as they'll nip fins relentlessly.

Common problems

Neon Tetra Disease

Yes, there really is a disease named after them — which is either an honour or a curse depending on how you look at it. Neon Tetra Disease is caused by a parasite (Pleistophora hyphessobryconis) and unfortunately there's no cure. Signs include faded colouring, cysts under the skin, and the fish becoming lethargic and separating from the shoal. If you spot it, remove the affected fish immediately to prevent spread. The best prevention is buying healthy fish from a reputable source and quarantining new arrivals before adding them to your main tank.

Ich (White Spot)

Small white spots on the body and fins, fish scratching against surfaces. Very treatable if caught early — raise the temperature slightly and use a proprietary ich treatment. Again, quarantining new fish before adding them to your tank is the best prevention.

Faded colours

If your Neons are looking washed out, it's usually one of a few things: stress (check your water parameters and make sure the shoal is big enough), poor lighting, or illness. A healthy, settled Neon Tetra in good water should have a vivid, bright stripe. If it's dull, something's not right.

Where to get them

We stock Neon Tetras regularly, and if you're buying a shoal it's worth taking advantage of our Buy 10 Get 2 Free deal — because honestly, you should be getting at least 10 anyway. You may as well get 12. 😄

Browse our full Tropical Fish collection or our Peaceful Community Fish range for more ideas on what to keep alongside them.

Final thoughts

Neon Tetras are one of those fish that never get old. Even experienced aquarists who've kept them for years still stop and watch a well-kept shoal moving around a planted tank. They're not the easiest fish in the world — they need clean water and a settled tank — but they're not difficult either. Get the basics right and they'll reward you with years of colour and movement.

Small fish. Big personality. Absolutely worth it.

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