The Paratheraps fenestratus I posted a while back turned out to be a female. She laid eggs. I generally keep males so I purchased a proven male and tossed it in with the female. She is a little bigger than him, and he was obviously stressed from shipping. I watched them a while and thought things were going okay. I got back a few hours later and the new male was beaten up and scaled. He was hiding near the surface. I have moved him to a divided tank and I've added some salt to the water. I didn't know a female would tear a male up like that upon adding one to the tank. I should have guessed though, I think, because he was really stressed and all from shipping. Hopefully he will heal up quick in a few weeks and I guess I need to find the female a new home. I could divide their tank I guess.