I have 2 ryukin in a 40 gallon. They are new fish and only about 1 1/2 inches long. My orange and white will not leave the calico alone. He (or she) likes to be as close and keeps his nose in the other fishes rear area (normal dog behavior, but I've never seen it in fish??) He also seems like he is cleaning the other, but there is nothing on the other fish to clean off. Is this normal? Whats going on? I feel like the other fish isn't getting any peace and quiet because this other one is just chasing it around. Water params are good and the temp is 72.5