Hello, Changongo, Clayn and Thomas, I had 4 Tembwe II half year ago. As mentioned above, I remain 2 now, and they behave as a couple. A few days ago, I added one from Isanga, the male Tembwe became very crazy, chased the Isanga, also the female Tembwe. I finally removed it to other tank. I try to post the photos and share to you all.