It sounds like you need 3-55's. put the fronts, comps ,& calvus in one tank, Aren't the ventus aggressive predators? ghost knifes are a commiunity fish. Labs and peacocks would go together, I think zebras are algae and veggie eaters, auratus are aggressive and need a high veggy diet, they'll get bloat if they eat to much meat and have the wrong diet, plecos and cats could probally go with any of them. I wouldn't mix all them types of fish together even in a 180.