Can mollies live with swordtails?

Yes, they make good tankmates. Good tankmates. Keep both at 72–79°F.

By Andy · Updated October 31, 2026 · Tankmate guide

Yes, they make good tankmates. Good tankmates. Keep both at 72–79°F.

Yes

Verdict

72–79°F

Shared temperature

30 gal

Smallest tank

The two fish side by side

Fish	Adult size	Temperature	Min. tank	Keep	Watch for
Molly	4 in	72–80°F	30 gal	3 or more	peaceful
Swordtail	4.5 in	72–79°F	30 gal	3 or more	peaceful

Set the heater to about 76°F, in the middle of the range they share (72–79°F).
Use a tank of at least 30 gallons. Check the numbers with the stocking calculator.
Keep mollies in a group of 3 or more. A big group is calmer and more colorful.
Keep swordtails in a group of 3 or more. A big group is calmer and more colorful.
Add plenty of plants and cover so every fish can get out of sight.

For mollies: Angelfish, Guppy, Platy, Amano shrimp, Black skirt tetra, Bristlenose pleco
For swordtails: Angelfish, Guppy, Platy, Amano shrimp, Black skirt tetra, Bristlenose pleco

Want to check a whole tank? Pick up to 8 fish in the fish compatibility checker, which opens with this pair already filled in.

Planning a whole tank? Your First Aquarium includes ready-made stocking plans and care cards for 15 beginner fish. Get the guide for $12