Jupiaba tetra

Where they come from

Jupiaba pinnata is one of those South American tetras that feels a bit "off the beaten path" compared to neons and rummynose. They come from faster-moving waters in the Amazon/Orinoco region (you will see them listed from different river systems depending on the exporter). Think clear to slightly tea-stained water, lots of wood and leaf litter along the edges, and current.

Setting up their tank

These are active fish. If you keep them in a small, still box of water they get twitchy and nippy. Give them room to cruise and a bit of flow and they settle into that confident, always-on-the-move tetra vibe.

• Tank size: 20 long works for a small group, but 30-40 gallons feels way better once they hit adult size and start really schooling.
• Group size: 10+ if you can. In 6 or fewer they tend to pick on each other and on tankmates.
• Filtration/flow: they appreciate noticeable circulation. A sponge filter plus a small powerhead, or a HOB with the output aimed along the length of the tank, works great.
• Layout: open swimming lane through the middle, plants/wood along the sides and back. They like to duck in and out, not live in a jungle.
• Substrate/decor: dark sand, leaf litter, and a couple chunks of driftwood makes their colors look better and keeps them calmer.

Water-wise, they are fairly forgiving for a tetra, but they do not love swings. I have had the best results with clean, stable water and regular water changes. Soft to moderate hardness is fine, and a slightly acidic to neutral pH is the easy zone. Warm tropical temps suit them (mid-70s to around 80F).

What to feed them

They are not picky once settled. The main thing is getting enough food into the whole group because they are quick and the bolder fish will hog it. I feed small amounts, spread out, and I like foods that stay in the water column a bit.

• Staples: quality flakes and small pellets (micro pellets are perfect).
• Frozen: brine shrimp, daphnia, cyclops, and chopped bloodworms as a treat.
• Live (if you do it): baby brine shrimp and daphnia get them in spawning condition fast.
• Plant matter: not a must, but a spirulina flake now and then seems to help with overall condition.

How they behave and who they get along with

Picture a classic schooling tetra, but with a little extra attitude. In a big enough group they spend most of the day cruising midwater and doing those quick, synchronized turns. In a small group, they can turn into fin inspectors.

• Best tankmates: other medium tetras, hatchetfish, pencilfish, Corydoras, small Loricariids, peaceful dwarf cichlids (Apistogramma) that are not super timid.
• Use caution with: guppies, long-finned bettas, fancy angels, slow gouramis - anything with tempting fins.
• Avoid: tiny shrimp colonies (they will snack on babies), and very timid nano fish that hate movement and competition.

Breeding tips

They are egg scatterers like a lot of tetras, and the adults will absolutely eat the eggs if given the chance. Breeding is doable, just more "planned" than with livebearers. If you want to try it, set up a separate tank so you can control the process.

• Breeding tank: 10-20 gallons, bare bottom or very thin substrate.
• Spawning media: a big clump of java moss, spawning mops, or a mesh/egg crate layer so eggs fall out of reach.
• Water: slightly softer and a bit warmer than the main tank usually helps. Clean water matters more than chasing a perfect number.
• Conditioning: lots of frozen/live foods for a week or two.
• Method: move in a pair or a small group (2 males to 1 female works), spawn at first light, then pull adults right after.

Common problems to watch for

Most issues I have run into with this species came from the same few things: stress from being under-grouped, too little swimming space, and tanks that run "a little dirty" for too long.

• Fin nipping: usually a social/setup issue (small group, cramped tank, not enough breaks in line-of-sight).
• Ich after shipment: they can come in stressed. Quarantine helps a lot, and keep the temperature stable.
• Weight loss despite eating: watch for internal parasites in newly imported fish (stringy white poop, hollow belly). Treat in quarantine if you see it.
• Red gills or hanging near the surface: check ammonia/nitrite first, then look at oxygen and flow (warm water plus low surface movement can bite you).
• Jumping: they are fast and spook easily. A lid saves lives.