Costae Tetra

Costae Tetra – Sleek Schooling Beauty from Brazil’s Rio São Francisco

Introduce motion and mystery to your aquarium with the Costae Tetra, also known as the Blackline Tetra. Native to the shallow reaches of the Rio São Francisco Basin in southern Brazil, this rarely seen species is prized for its tight schooling behavior, subtle shimmer, and bold black tail stripe. A favorite among aquascapers, the Costae Tetra brings flash and fluidity to planted tanks and peaceful communities.

Highlights:

• ✅ Striking Tail Stripe – Bold black line across the caudal peduncle adds contrast and visual depth

• ✅ Tight Schooling Behavior – One of the most synchronized swimmers among tetras

• ✅ Peaceful & Active – Ideal for planted tanks with open swimming space

• ✅ Rare & Sought-After – A hidden gem among South American tetra species

• ✅ Hardy & Adaptable – Tolerates a wide range of water conditions