Can Black skirt tetra live with Guppy?

Temperature. Black skirt tetra does best at 22–26 °C (72–79 °F) and Guppy at 18–28 °C (64–82 °F). They share 22–26 °C.

Water. Their pH ranges overlap at 7–7.

Temperament and size. Black skirt tetra is semi-aggressive and grows to 7.5 cm; Guppy is peaceful and grows to 6 cm. Black skirt tetra swims at the mid and Guppy at the top, which spreads them out.

Tank size and groups. Plan on at least 20 US gallons, the larger of the two cautious minimums. Keep Black skirt tetra in a group of 12+. Keep Guppy in a group of 3+. A starter mix of 12 Black skirt tetra and 3 Guppy in 20 gallons uses about 182% of the tank’s bioload capacity under our rules and grades C.

Keeping them together

• Feeding: both feed in open water. Feed small amounts two or three times a day so the slower eater gets its share.
• Aquascape: break up sight lines with plants, wood or rock, and give each fish its own hiding spots. Territorial fish settle faster when they can’t see each other all the time.
• Group size: a full group is not optional. A schooling fish kept in too small a group is stressed and more likely to nip or hide.
• Shrimp and snails: neither is a known invertebrate eater, but baby shrimp can still be eaten. Dense moss helps.
• Adding them: add the calmer species first and let it settle for a week or two before adding the other, and only once your tank has cycled.

Better matches for Black skirt tetra

These pass every rule with Black skirt tetra: Cherry barb · Dwarf gourami · Harlequin rasbora · Honey gourami · Molly · Platy · Tiger barb · Zebra danio.

Open this pair in the checker Add your other fish to grade the whole tank.

Quick facts

Data from the Species Ledger, checked November 9, 2026, with at least two sources per species. Cautious community guidelines, not guarantees: individual fish vary. Not veterinary advice. Disagree? Tell us.