Not recommended — a oscar and german blue ram are a risky mix.
Temperatures line up — both thrive around 78–81°F.
pH preferences overlap (6–7) — easy to keep both comfortable.
The oscar is big and predatory enough to eat the german blue ram — likely a meal, not a tankmate.
The oscar is aggressive and will likely harass or harm the german blue ram.
Plan on at least 55 gallons for the pair (the larger of their two minimums).
Can a oscar and german blue ram live together?
Not recommended — a oscar and german blue ram are a risky mix. Minimum tank for the pair is about 55 gallons.