My congo tetra the (larger male) is showing aggression. He's chasing some of the other fish around the tank, and I just witnessed a big scrap with my gourami. No fins were damaged but it looked pretty fierce. There are 2 female congo's but they are a bit smaller then him. I'm thinking hes wanting to mate. I'm not sure. From everything I've read about congo's is that they are very passive fish and show no aggression. I'm worried that it's just going to escalate. what are my options if there are any?