Not recommended — a oscar and zebra danio are a risky mix.
Temperatures line up — both thrive around 74–77°F.
pH preferences overlap (6.5–7.5) — easy to keep both comfortable.
The oscar is big and predatory enough to eat the zebra danio — likely a meal, not a tankmate.
The oscar is aggressive and will likely harass or harm the zebra danio.
Plan on at least 55 gallons for the pair (the larger of their two minimums).
Can a oscar and zebra danio live together?
Not recommended — a oscar and zebra danio are a risky mix. Minimum tank for the pair is about 55 gallons.