Hi, I have a 75 gallon fish tank, i have in it. 13inch Red Devil boss of the tank, 12inch black shark, 10 different size convicts. I want to get a jaguar or a oscar, but i think its better to get the jaguar cause oscars are messy and might be to much for the tank. I have lots of hiding places for the fish, the convicts have babys all the time, but they dont live get eaten. All the fish are aggresive in the tank but they dont fight just case. If u have any tips pls help