Mine go to sleep behind the in-take and out-flow tubes of the Fluval. I've always wondered if fish are still when they sleep. I now know they make really exaggerated swimming motions!
And one of them keeps snapping towards the other. I'm going to assume THAT'S the female! I don't know if she's actually biting him or not, and she doesn't harass him or anything. Just occasionally when he's near she'll snap at him! :yes: