Thank you for your suggestion in the last threat. Finally, this fish, Aimara, stay in my tank. My tank is 48x20x20 inches. It look too small for him. i will upgrade my tank in the future. This Aimara is about 14 inches. IT very aggressive. It try to attack my finger!!! I know it should stay alone but i put the flag-tail as tankmate and observe closely. I know there is high risk . From now no any problem. Do you have any experiece about mixing the Aimara and the tankmate in the same tank without any the clash?
