i'm goint to buy a new 100 gallon fish tank soon. I will be running 2 Ehiem 2217 filters on it with 2 emperor 400 filters on also. I now have 2 JD, 2 GT, 1 RD and 1 Oscar mixed in a tank with africans. I know this shouldn't be done but like I said that is why I'm buying the new tank. I know i'll have to get rid a few fish but i want to keep the meanest . which one can i keep?