I think my 4,800 gallons pond is enough, but I agreed about the fact that they are hit or miss. I owned one before, it was peaceful, extremely peaceful, but after I separated it from the other fish, and let it lived alone for a whole month, and once I put it back with other fish, it becomes more aggressive than the oscars.ive never owned one, but i heard they can be hit or miss, they can either be the ones to cause aggression, or they can help keep the peace, they will eventually outgrow the cichlids, and need a bigger tank