Yes, German blue rams can live with bettas. Despite being cichlids, German blue rams are rather peaceful. They’re also not fin-nippers.
Bettas typically only show male-to-male aggression. Unless provoked, bettas are unlikely to attack other fish. With that in mind, German blue rams and bettas could tolerate each other.
However, you should monitor the tank dynamics regularly and be prepared to separate the fish if the environment becomes hostile. Here are some useful tips to prevent aggression between your German blue rams and bettas:
- Avoid overcrowding the tank
- Provide plenty of plants, decorations, and hiding spots
- Try keeping female bettas instead of their male counterparts
- Keep any spawning fish in a separate tank