Hey I have a question about paring two YWG together. There only about two years old and male and female but there’s a lot of aggression between them!!! When I first introduced the female today they didn’t notice each other for about 20 minutes but then they both saw each other and swam right next to each other. Everything was good for about 5 minutes then they started opening there mouths really wide and then locked jaws!!! This was on and off for about 2 hours until they both went into hiding. So my question is what did I do wrong or what should I do? Any help is great thanks!!!