Cories have no concept of territory so they never learn to keep out. But it is only breeding rams that would cause a problem, they become very protective of their eggs/fry and will chase other fish away. Most will learn to stay away but not cories.
If you were to get just one Bolivian ram, cories would be OK. Byron has said that Bolivian rams can be kept as just a single fish, and this would solve 2 problems - no potential breeding to upset the cories and it means no trying to find a bonded pair.
If you were to get just one Bolivian ram, cories would be OK. Byron has said that Bolivian rams can be kept as just a single fish, and this would solve 2 problems - no potential breeding to upset the cories and it means no trying to find a bonded pair.