Live fish · WA only
Blackline Tetra (Moenkhausia costae)

A silver tetra with a black tail spot that schools with confidence.

Care levelEasy, a great first fish
EasyModerateExpert
Water temperature23 to 28°C
18°C32°C
Group sizeKeep 5 or more
Adult size5.5cm
LivesMiddle
DietOmnivore
SuitsCommunity tanksPlanted tanks

Blackline Tetra

Moenkhausia costae4.6(26)reviews
Easy carePeacefulKeep 5+
Choose an option

Best kept in a group, so most scapers start with a pack of five.

14 in our tanksShips Tue or Wed
Live fish delivery, WA only$35 Perth metro and Mandurah, $65 rest of WA. One fee covers your whole order, plants and dry goods included. Sent overnight on Tuesdays and Wednesdays to a street address (no PO Boxes).
Free pickup in KenwickOpen Tue to Sat, 12pm to 6pm

A silver tetra with a black tail spot that schools with confidence.

Care levelEasy, a great first fish
EasyModerateExpert
Water temperature23 to 28°C
18°C32°C
Group sizeKeep 5 or more
Adult size5.5cm
LivesMiddle
DietOmnivore
SuitsCommunity tanksPlanted tanks

Pairs well with this fish

Picked by our team to go with this.

Fritz Complete Water Conditioner 236ml/8oz $24.95
Sera Flora Flakes From $10.95
Ambulia $4.50
About this fish

Costae Tetra is a striking choice for planted aquariums, appreciated for its subtle coloration, active schooling behavior, and adaptability.

Why you will love it

  • Active mid-water schooling fish in peaceful community tanks (min. 5)
  • Subtle silver body with delicate markings adds natural elegance
  • Grows to an approximate size of 4–5 cm
  • Best kept in groups of 6+ for natural behavior
  • Peaceful temperament, ideal with similarly sized tankmates

Care requirements

  • Care level: Easy
  • Adult size: 4–5 cm
  • Temperature: 22 to 26 °C
  • pH: 6.0 to 7.5
  • Swimming level: Mid
  • Minimum group size: 5+

Feeding:
Offer a varied diet. A quality staple (flake or micro-pellet) supplemented with frozen or live foods (such as brine shrimp, daphnia, and bloodworms) will enhance health and coloration.

Compatibility:
Best suited to peaceful community tanks with small, non-aggressive species. Avoid housing with fin-nippers or significantly larger, aggressive fish.

School of Scape quality:
We select healthy fish and recommend proper acclimation and stable water parameters to ensure long-term success.



How your fish arrive

Packed in oxygen filled bags inside an insulated box and sent overnight by air express on Tuesdays and Wednesdays.

Live arrival

8 hour live arrival guarantee. If a fish arrives dead or clearly stressed from transit, contact us within 8 hours of delivery with photos of the fish in the original sealed bag, and we will replace or refund it. Freight is not refundable, and someone needs to be home to accept the delivery. Remote far north WA (Gascoyne, Pilbara and Kimberley) is sent at your own risk.

Read the full policy

Delivery and returns

Free delivery over $100 in WA and $150 elsewhere in Australia. Free pickup from our Kenwick store, Tue to Sat, 12pm to 6pm.

Returns policy