I have a 180 gallon tank that has housed 6 silver dollars, 1 Oscar, 1 Severum, 1chocolate all adult size and a NTT Datnoid 4inches for 8 years now with the dat being added a year ago. My Oscar just passed I assume of natural causes as all water readings came back good. I want to revamp the tank and here's what I was thinking. I want to keep my 6 Silver Dollars, I want to keep my Green Severum but add 2 more of different species (color), keep my Datnoid, get rid of my Chocolate that's about 14 inches and he's rare Coryphaenoides, and add 1 Red OR Tiger Oscar AND 1 Albino Tiger Oscar. Let me know what your feed back is as I have been keeping cichlids for a long time and have narrowed down what I want to keep. I will keep 1 Oscar if I have to but really want to try 2 hoping by a miracle I get a pair. I also have a 120g that houses 1 very mean Midas. Thanks guys!