Compatibility brief
Can Oscar live with Siamese Algae Eater?
Risky. This mix is commonly discouraged for typical setups.
Compatibility score
Profile confidence: low
How we decideFishori checks adult size and predation risk, behaviour, water requirements and tank needs before giving a verdict.
300L
Combined minimum footprint reference for these two species: about 300L (larger active fish often want more length).
Oscar (aggressive) and Siamese Algae Eater (peaceful) are far apart on aggression — bullying or injury is a common outcome in average community layouts.
Assessment details
Aggression mismatch
Top issueOscar is aggressive, while Siamese Algae Eater is peaceful. The aggressive fish will likely bully or harm the peaceful one.
Compatible temperature range
Both fish can comfortably share similar water temperatures.
“Oscar is aggressive, while Siamese Algae Eater is peaceful”
Aggression mismatch
Next steps
Concrete changes, not "research more" filler.
- •Oscar reaches ~35cm: tank length and turning room matter more than the litre number. A tall, short tank of the same volume is not equivalent.
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. Astronotus ocellatus
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Astronotus ocellatus
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Astronotus ocellatus
Secondary: general species context; verify all husbandry numbers against a dedicated aquarium care sheet and your test kit, not a single table row.
- Wikipedia. Astronotus ocellatus (oscar)
Encyclopaedia overview; use specialist aquarium sources for your stock's real temperature/pH/footprint needs.
- LiveAquaria. Siamese Algae Eater (care profile)
Primary: retailer care sheet: tank size, water parameters, diet, and use in planted community tanks. Commercial copy may list C. siamensis; trade 'SAE' is often a mix of similar Crossocheilus. Identify the fish, not the bag label alone.
- Planet Catfish. Labeoninae (Crossocheilus and look-alikes)
Primary: Cat-eLog subfamily list for Crossocheilus and related Asian labeonins; the standard reference when separating SAE from Epalzeorhynchos 'flying foxes' and other doppelgängers.
- FishBase. Crossocheilus oblongus
Secondary: species-level taxonomy and size in the wild; reconcile with the fish in your tank, not every shop's name tag.
Try this next
Build the full stocking list with Oscar + Siamese Algae Eater
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: medium. Driven by the lower-confidence profile (Siamese Algae Eater): Typical care sources — trade names for this fish get mixed up, so verify the ID before you buy.