No, two rainbow sharks cannot live together. Rainbow sharks are highly territorial and aggressive. Additionally, they naturally lead solitary lives in the wild, so they don’t tolerate fellows of their species well.
In general, you should only keep one rainbow shark in a tank, especially if you’re a novice fishkeeper.
However, if you want to keep more than one rainbow shark in the same tank, you can follow these guidelines:
- Keep at least five rainbow sharks together, so the dominant ones have multiple rivals to chase around
- Start introducing them when they’re juveniles
- Each rainbow shark requires at least a meter of separated territory to reduce aggression
- Provide plenty of plants and hiding spots in the tank