Sorry for the delayed response. Before bashing me take note that I was just trying different ideas to fix aggression, along with not a ton of experience. My tank is only 85 gallons (dimension= 72"x15"x18"). I did a ton of research before getting the arowana and knew that my tank is nowhere near ideal, however ive seen them in small tanks, and with the same species cihlids as I have, plus I planned on upgrading when it became necessary. As for the abundance of cichlids, I was attempting to curb aggression by adding more fish since it was suggested be many people, plus I was taking care of my friends fish while his dad battles lung cancer. They all said it was a huge risk and it may not work. It obviously didn't. Like I said before I am nowhere near as experienced as many of you and there is really one way to get experience and that is to actually try stuff out. Unfortunately for me it put me out a considerable amount of money and ended the lives of some super cool fish.. I have learned from these trials and error and I am done buying more fish until my current stock is gone . I am down to The JD, RD, and the Pleco. My friend will soon be taking back his green terror and his small JD since his dad passed last night. Soon I will only have my 2 larger cichlids and the pleco. I want to grow them out as big as possible (I know I will need to upgrade my tank). Thanks for all the input! It really helps a lot since I am trying to learn as much as possible about the hobby.