Hi there. So I have a Fluval evo 13.5 setup and have a 2 clowns and a royal gramma. The clowns do this weird twitching thing. The female with come up to the male and try to show Dominance but as soon as she touches the male he does this weird twitch thing. It lasts like 3-5 seconds then they are back to normal. The female has done it once before too. Does anyone know what this might be ?