I have two severums in a 29 gallon tank. I know, I don't have to guess what you're going to say. But to the concerning point. They're in the tank, not showing any signs of sexual dimorphism yet that I know of, and I missed my water changes for the last 2 weeks. So today I do a huge (70%) water change. About 6 hours later. I see my sevs in the corner of the tank. My larger one, about 5.5" long, has the whole mouth of the littler sev (4.5") in its mouth. It caught me off guard. Are they breeding, or what's going on? I don't no what to do, or if I should sepparate. They're breathing kind of heavy, so I'm really nervous. Any help will be greatly appriciated.