I searched but didn't the answers to a couple questions I have. I have a 75 gallon FW setup with several fish including two Senegal Bichirs both 6-8", one convict about 4 inches and two suncats both about 8 inches. I am not worried about the Oscar but worried about the others. Would they be compatible? If I get an Oscar it will be a juvenile if that matters. Second question, are they ok alone or do they do better in pairs? I want the Oscar(s) to be as happy as possible and I know a 75g tank isn't enough for two of them, especially with the above tank mates. I do however plan on upgrading but that would not likely happen until next year after our house addition is complete. And one more question, do the colors and markings stay as the fish gets older? Just wondering if I find a youngster that has great markings and coloration if they could or would change as the fish got older. Thanks and sorry for the basic newb questions.