Compatibility brief
Can Neon Tetra live with Red-tailed catfish?
Risky. This mix is commonly discouraged for typical setups.
Neon Tetra + Red-tailed catfish: Aggression mismatch. Red-tailed catfish is aggressive, while Neon Tetra is peaceful. The aggressive fish will likely bully or harm the peaceful one. Real tanks add variables Fishori cannot model; treat this as a high-risk read, not certainty.
Compatibility score
Profile confidence: medium
Order of checkstank volume vs adults → predation mouth gap → temperament / fin nipping → shared water windows.
2000L
Combined minimum footprint reference for these two species: about 2000L (larger active fish often want more length).
Red-tailed catfish (120cm adult) may treat small Neon Tetra (~4cm) as food once grown — plan adult sizes, not shop sizes.
Neon Tetra (peaceful) and Red-tailed catfish (aggressive) are far apart on aggression — bullying or injury is a common outcome in average community layouts.
Assessment details
Aggression mismatch
Top issueRed-tailed catfish is aggressive, while Neon Tetra is peaceful. The aggressive fish will likely bully or harm the peaceful one.
Red-tailed catfish may eat Neon Tetra
Red-tailed catfish (120cm) is predatory and Neon Tetra (4cm) is small enough to be eaten. This pairing is unsafe.
Narrow temperature overlap
Neon Tetra and Red-tailed catfish have only a narrow shared temperature range. Maintaining stable water temperature will be important.
“Red-tailed catfish is aggressive, while Neon Tetra is peaceful”
Aggression mismatch
Next steps
Concrete changes, not "research more" filler.
- •Neon Tetra should be kept in a group of at least 6 for best health and behaviour.
Try instead
- →Neon Tetra should be kept in a group of at least 6 for best health and behaviour.
- →Build a species-only tank for the larger fish, or restock with fish too large to be eaten at adult sizes.
- Seriously Fish. Paracheirodon innesi
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Paracheirodon innesi
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Paracheirodon innesi
Secondary: general species context; verify all husbandry numbers against a dedicated aquarium care sheet and your test kit, not a single table row.
- Seriously Fish. Phractocephalus hemioliopterus
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Phractocephalus hemioliopterus
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Phractocephalus hemioliopterus
Secondary: general species context; verify all husbandry numbers against a dedicated aquarium care sheet and your test kit, not a single table row.
Try this next
Build the full stocking list with Neon Tetra + Red-tailed catfish
Plan further
Try both species in the full-stock tank check, or open either fish profile for mates lists. Methodology explains how verdicts are produced.
Individual fish vary in personality. Fishori uses conservative hobby rules. Observe any new introduction closely, feed thoughtfully, and keep a quarantine or backup plan. This is not veterinary advice.
Profile data confidence: high. Based on multiple reputable aquarium care sources with strong agreement.