Should I buy it?
Lemon Tetra
Hyphessobrycon pulchripinnis
Transparent-bodied tetra with yellow fin edges. Colour develops at full saturation only in soft water with good nutrition and planted background.
Lemon Tetra tank mates · 60L tank size hub
peaceful · beginner care
Sources & confidencehigh · partially verified · beginner: excellent
Checked against several solid care sources that mostly agree. Numbers here are a careful starting point. Your tap water, tank size, and habits decide the rest. How we evaluate.
Best for: Soft-water planted community tanks 60L or more with a school of eight alongside other small peaceful tetras.
Avoid if: Hard alkaline tap water or tanks with cichlids and large mid-water predators.
Common mistakeRunning bright lighting with no tannins or plant shade is how keepers invent colourless lemon tetras that look like generic yellow fish. Soften the light, add cover, and keep six or more — the lemon flush is a husbandry result, not a bag lottery win alone.
Top things that go wrong
- Group welfare — not a solo display fish. Plan at least **6** together for normal behaviour; smaller groups often mean stress, colour loss, or nipping depending on species.
- Shrimp & snails. Cherry shrimp and other dwarfs can coexist with peaceful small fish; baby shrimp are food for almost anything that finds them.
What most shops don't tell you
- 1.Myth: lemon tetras stay bright yellow in any high-light planted show tank as hardy beginner tetras. Reality: harsh light and tiny groups wash them out — they need a real school and softer presentation to show the colour people buy them for.
- 2.Buying three or four to start. Lemon Tetra settles in a group of 6 or more. An understocked school sulks at the back of the tank and loses colour within a fortnight.
- 3.Juveniles in bare shop tanks look nearly colourless. The yellow body and black-edged fins develop only in aged water with a touch of tannin. A school of eight shows more confidence and activity than a group of six.
About this species
Lemon tetras are translucent yellow characins with black edging on the dorsal and anal fin. A calm mid-water schooler that holds formation. Colour and fin contrast deepen as the tank matures and the water picks up light tannin staining.
- Beckford Pencilfish60L min · same group, comparable tank size
- Black Neon Tetra60L min · same group, comparable tank size
- Bloodfin tetra60L min · same group, comparable tank size
- Cardinal Tetra60L min · same group, comparable tank size
- Glowlight Tetra60L min · same group, comparable tank size
- Green neon tetra60L min · same group, comparable tank size
- Silver Tip Tetra60L min · same group, comparable tank size
- X-ray tetra60L min · same group, comparable tank size
- Amano Shrimpalso beginner peaceful, similar tank size
- Assassin Snailalso beginner peaceful, similar tank size
- Beckford Pencilfishalso beginner peaceful, similar tank size
- Black Neon Tetraalso beginner peaceful, similar tank size
- Black phantom tetraalso beginner peaceful, similar tank size
- Bloodfin tetraalso beginner peaceful, similar tank size
No reverse lookups listed yet.
Plan grid
Key limits are above. Here: pH band, swim level, bioload, and activity.
Swim zones
Care snapshot
Quick compare before you buy. Not a score of how “good” the fish is.
- Beginner ease82
- Peacefulness90
- Community fit83
- Small-tank fit100
- Hardiness76
- Energy54
Numbers are deterministic planning indices from Fishori fields — not a scientific score of your individual fish.
Example setups
Starting points only. Run the pair checker for every fish you add.
Rough 90L+ layout: one calm centrepiece, 8–12 small tetras/rasboras, 6–8 corydoras-type bottom fish — verify every name in the pair checker before buying.
Safer directions include: Corydoras Catfish, Ember Tetra, Harlequin Rasbora.
Prioritise 6+ of Lemon Tetra in 60L+ with filtration sized for messy feeding — add only mates that already pass pair checks with this species.
Compatibility
Tank mates for Lemon Tetra
Usually safer (engine GOOD): Corydoras Catfish, Ember Tetra, Harlequin Rasbora, Neon Tetra. Conditional (CAUTION — read the pair page before buying): Angelfish, Betta, Discus, Tiger Barb. Avoid (RISKY): Green Terror, Jack Dempsey, Oscar. Every name links to a live pair check — the lists are a shortlist, not a stocking plan.
Usually safer
Open a pair page with this fish as the starting point.
Needs planning
Read the blocking rule on each pair page before experimenting.
Usually avoid
Do-not-stock combinations on conservative hobby rules.
Compare with
Run a real pair check: Lemon Tetra + Corydoras Catfish
Behaviour and temperament
Lemon tetras are peaceful schoolers that stay calmer in groups of six or more with planted cover and gentler light. They do not bully robust neighbours. Stress shows as fading and skittish pacing when under-grouped under harsh bare lighting with nowhere to settle.
What sets them off
- Sudden crowding
- Poor water quality
Fin nipping: Not a habitual fin-nipper; stressed or crowded individuals can still test fins.
Predation: Not a predator toward similarly sized community fish; fry and dwarf shrimp are still fair game for most species.
Territory: Not strongly territorial, but still needs room so its working space does not overlap the next fish.
Planted tanks: excellent — easy plant ideas
In the glass: typical and warning signs
- Six or more hold midwater as a soft yellow school among plants.
- Colour deepens when light is gentler and the group feels secure.
- Washed-out fish under spotlights usually means light and cover first.
- A nervous trio needs more of their own kind before a different staple.
- Low listed risk as aggressors.
- Fin-nippers and large cichlids are the usual failure modes — not lemon malice.
- Add plant shade and grow the school before rehoming for 'bad colour.'
- Remove nippy barbs at the first torn fin.
Fish behaviour can vary between individuals and tank setups. Always observe new fish closely after introduction.
Water, food, and grouping
Hardness
soft
Diet
omnivore
Lemon tetras are small omnivores that take micro-pellets, quality flake, and fine frozen foods in a school of six or more. Harsh bright aquascapes without plant cover leave them washed out even when food is correct. Feed small portions they finish, keep a real school, and expect colour to improve when light and tannins are kinder.
Shrimp & snails
Cherry shrimp and other dwarfs can coexist with peaceful small fish; baby shrimp are food for almost anything that finds them.
Schooling species — buy 6+ together. Smaller groups stress and lose colour.
- Hold 22 to 28 °C steadily on a real thermometer, not the dial on the heater.
- Aim for pH 5.5 to 7.5 and a hardness you can re-test in two weeks. A one-time strip in the shop car park is not a water test.
- Schooling species. Buy 6 or more from the same tank on the same day before adding any centrepiece fish.
- Tank volume meets or exceeds 60L published minimum for adults.
- You can stock at least 6 individuals (group welfare).
- Heater can hold 22–28°C without cooking cooler-water tank mates.
Explore and stocking hubs
Tank-mates hub, matching guides, category peers, and litre stocking lists around this species’ minimum tank.
Plan with tools
Check mates as pairs first, then add this fish in the tank builder for the full stocking.
Filtration & heating
A 60L minimum tank needs a filter rated for at least 240L/hr turnover and a heater to hold 22–28°C reliably.
Plant suggestions
Lemon Tetra does well in planted tanks. Plants compatible with 22–28°C and pH 5.5–7.5:
Research: partially verified · Confidence: high · 3 linked source(s). We do not invent citations.
How Fishori evaluates compatibility (same logic as pair and tank tools).
- Seriously Fish. Hyphessobrycon pulchripinnis
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Hyphessobrycon pulchripinnis
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Hyphessobrycon pulchripinnis
Secondary: general species context; verify all husbandry numbers against a dedicated aquarium care sheet and your test kit, not a single table row.
Evidence notes
- The Seriously Fish profile for the binomial in this record was successfully reached as the primary aquarium reference.
- FishBase contributes natural-range size and habitat context. Translate those numbers through your heater, your water report, and your tank footprint before stocking.
- Wikipedia is only cited if the article URL returned OK. Use it for orientation, not as the only care sheet for an import.
- All compatibility text reflects typical hobby experience and the Fishori model. Individual fish, shop stress, and the order tank mates are added in can still defy a single-paragraph label.
Featured compatibility checks
Curated pair pages for Lemon Tetra. Each opens a full verdict — not just a list label.
Common questions about Lemon Tetra
- How big do Lemon Tetra get?
- Lemon Tetra adults reach about 4 cm. Shop fish look smaller; stock for the adult length.
- What size tank does Lemon Tetra need?
- 60L is the planning floor for adult swimming space and bioload. A 73L+ tank is the more comfortable long-term footprint. Length and depth matter as much as raw litres for active or territorial fish.
- Are Lemon Tetra aggressive?
- Lemon tetras are peaceful schoolers that stay calmer in groups of six or more with planted cover and gentler light. They do not bully robust neighbours. Stress shows as fading and skittish pacing when under-grouped under harsh bare lighting with nowhere to settle.
- Do Lemon Tetra need to be kept in a group?
- Schooling species — buy 6+ together. Smaller groups stress and lose colour.
- What is the most common mistake with Lemon Tetra?
- Running bright lighting with no tannins or plant shade is how keepers invent colourless lemon tetras that look like generic yellow fish. Soften the light, add cover, and keep six or more — the lemon flush is a husbandry result, not a bag lottery win alone.
- What fish can live with Lemon Tetra?
- The Lemon Tetra profile lists Corydoras Catfish, Ember Tetra, Harlequin Rasbora, Neon Tetra among its safer pairings (engine-checked GOOD). Angelfish, Betta, Discus, Tiger Barb are conditional (CAUTION): workable only with the specific conditions on each pair page. Avoid Green Terror, Jack Dempsey, Oscar (RISKY). Run the pair checker for your exact water and tank size before stocking.