I am so very confused, but in a good way. Just two days ago, my big black angelfish, Kai, went after my new baby koi angelfish, Cole. That was as expected, she saw the tank as hers, and a new angel was not welcome. But, what I did yesterday, was take Kai out, put her in a bucket away from the tank, rearrange all the plants and swap some decorations, and release her back in. Her behavior changed completely. First question: At first, when Cole came over to Kai after I put her back in, she clamped her fins, opened and closed her mouth rapidly, and backed away from him. Is that submission? I've never seen an angel do that to another before. Second: What is up with their behavior now? They follow each other around the tank 90% of the time. Sometimes they just hover really close to each other, side by side. Other times, they hover nose-to-tail. But most often, Cole will come up to Kai and they will go nose-to-nose, pretty much touching, just looking at the other. Can anyone make any sense of this?