Can an angelfish live with neon tetras?

Sometimes, with care.

Temperatures barely overlap (75–77°F), leaving no margin.

Plan on a tank of at least 30 gallons for both.

By tank size

Below 30 gallons there isn’t enough room for both, so the answer is no.

How to try it

Use a mature tank of at least 30 gallons, with the heater set around 76°F so you stay inside the 75–77°F window both fish accept. Keep a school of at least 6 neon tetras (more is better), and add tall plants like Amazon swords or vallisneria plus floating cover so the neons have places to retreat and the angelfish has vertical space.

1. Only start once the tank is fully cycled and mature, since neon tetras don't do well in a new tank.
2. Set the heater to 76°F and confirm with a reliable thermometer that it holds steady before any fish go in.
3. Add the full group of at least 6 neon tetras first, so they settle in and school together before the angelfish arrives.
4. Add one young, small angelfish later, rather than an adult, so it grows up with the neons and sees them as tank mates.
5. Feed the angelfish well before the neons' lights-out and keep an eye on the group at feeding time for the first few days.

Warning signs in the first weeks

• The angelfish chasing, cornering, or mouthing neons, especially as it grows toward its adult 5–6 inch size.
• Your neon count slowly dropping with no bodies found, which can mean they're being eaten.
• Neons hiding constantly in plants or corners, or the school breaking up instead of swimming together in the middle of the tank.
• Neons looking stressed or sluggish, or the angelfish looking pale or clamped, which can mean the 75–77°F temperature window isn't holding steady.

Backup plan: If the angelfish keeps hunting the neons or you start losing them, separate the fish. Move the angelfish to its own tank (30 gallons is the minimum), or move the neons to a different tank where the temperature can be set lower. Don't wait for losses to build up before acting.

How we reached this verdict

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