Compatibility brief
Can Apistogramma Macmasteri live with Oscar?
Risky. This mix is commonly discouraged for typical setups.
Apistogramma Macmasteri + Oscar: Oscar may eat Apistogramma Macmasteri. Oscar (35cm) is predatory and Apistogramma Macmasteri (7cm) is small enough to be eaten. This pairing is unsafe. 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.
300L
Combined minimum footprint reference for these two species: about 300L (larger active fish often want more length).
Oscar (35cm adult) may treat small Apistogramma Macmasteri (~7cm) as food once grown — plan adult sizes, not shop sizes.
Temperament gap (semi-aggressive vs aggressive) — can work with space, structure, and careful observation, but not a “drop and forget” mix.
Assessment details
Temperament difference
Oscar is aggressive, while Apistogramma Macmasteri is semi-aggressive. This can work with adequate space and hiding spots, but monitor for bullying.
Oscar may eat Apistogramma Macmasteri
Top issueOscar (35cm) is predatory and Apistogramma Macmasteri (7cm) is small enough to be eaten. This pairing is unsafe.
Compatible temperature range
Both fish can comfortably share similar water temperatures.
“Oscar (35cm) is predatory and Apistogramma Macmasteri (7cm)…”
Oscar may eat Apistogramma Macmasteri
Next steps
Concrete changes, not "research more" filler.
- •Provide plenty of hiding spots and visual breaks so Apistogramma Macmasteri can escape if harassed.
Try instead
- →Provide plenty of hiding spots and visual breaks so Apistogramma Macmasteri can escape if harassed.
- →Build a species-only tank for the larger fish, or restock with fish too large to be eaten at adult sizes.
- Seriously Fish. Apistogramma macmasteri
Primary: species page covering Meta basin habitat, soft acidic water requirement, and the strong territorial behaviour at spawning sites.
- Practical Fishkeeping. Macmaster's Apistogramma
Secondary: editor coverage of colour variants (gold, red-mask) and the strong line-breeding of the species in the hobby.
- 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.
Try this next
Build the full stocking list with Apistogramma Macmasteri + Oscar
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.