Right now i have a 55 gallon with a red oscar that is about 6", a meeki 2", a jack dempsey 2.5" and I wanted to add another fish because in a couple months i was going to get around a 100 gallon tank. SO i went to the local fish store and they recommend a Bleeki but my jack chases it around since i have put it in there and this fish is 3". how can I stop that? They also said that I could put a green terror or red terror in the tank also. Is this true? I use to have another red oscar about the same size but it was killed by the oscar i have now. I also had a fish that started with a g but don't remember what it is because it was really long name but my oscar ate him. I did have a severum but i was getting to beat up by my jack and meeki so I put it in the tropical fish tank and now it is much happier. What other fish could I put in my tank? Any help would be helpful.