Compatibility brief
Can Angelfish live with Threadfin rainbowfish?
Risky. This mix is commonly discouraged for typical setups.
Compatibility score
Profile confidence: medium
How we decideFishori checks adult size and predation risk, behaviour, water requirements and tank needs before giving a verdict.
150L
Combined minimum footprint reference for these two species: about 150L (larger active fish often want more length).
Angelfish (about 20cm as an adult) can realistically eat Threadfin rainbowfish (about 3.5cm) once grown. Plan around adult sizes, not shop sizes.
Temperament gap (semi-aggressive vs peaceful) adds stress on top of the hard incompatibility — space and cover do not make this pairing safe.
Assessment details
Temperament difference
Angelfish is semi-aggressive, while Threadfin rainbowfish is peaceful. Expect chasing or stress unless the tank is large and heavily structured — monitor closely.
Angelfish may eat Threadfin rainbowfish
Top issueAngelfish (20cm) is predatory and Threadfin rainbowfish (3.5cm) is small enough to be eaten. This pairing is unsafe.
Compatible temperature range
Both fish can comfortably share similar water temperatures.
“Angelfish (20cm) is predatory and Threadfin rainbowfish (3”
Angelfish may eat Threadfin rainbowfish
Next steps
Concrete changes, not "research more" filler.
- •Provide plenty of hiding spots and visual breaks so Threadfin rainbowfish can escape if harassed.
- •Threadfin rainbowfish should be kept in a group of at least 8 for best health and behaviour.
Try instead
- →Build a species-only tank for the larger fish, or restock with fish too large to be eaten at adult sizes.
- Seriously Fish. Pterophyllum scalare
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Pterophyllum scalare
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Pterophyllum scalare
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. Iriatherina werneri
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Iriatherina werneri
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Iriatherina werneri
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 Angelfish + Threadfin rainbowfish
Plan further
Check each species’ mates list, size the glass, then verify the full stock in the builder. 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. Checked against several solid care sources that mostly agree.