German Blue Rams, in general, are peaceful species and can live with other similar temperament fish species. Ideal tank mates include species like Tetras, Guppies, Mollies, Corydoras Catfish, and other Dwarf Cichlids. These species usually stay away from the bottom dwelling Rams, reducing territorial disputes.
However, ensuring the chosen companion fish can thrive in similar water conditions, especially temperature, is essential as German Blue Rams prefer warm, slightly acidic water. Monitor and manage the fish interaction initially to alleviate any possible bullying or tension. The tank size also plays a key role in peaceful coexistence, so ensure your aquarium is spacious enough for all inhabitants.