The Emperor Tetra (Nematobryconpalmeri) thrives best when kept in aquariums with lots of plant life. They may go to reproduce if you have a small group of them present. Experts recommend that you keep the Emperor tetra in groups of five or more. Since they are tetras, occasional fin nipping is not a surprising occurrence. When you keep emperor tetras in a small group, it will help in keeping their focus on one another as breeding continues.
The maximum length attainable by Emperor Tetras is 4.2 cm. The emperor tetras adapt to a relatively broad range of conditions of water regarding pH and dKH. Emperor tetras are characteristically tropical, so its best a temperature of 70’s F is maintained.