Do you want a community? or a pair? or maybe a colony of same species?
Communities are do-able in a 150, but much more difficult to successfully pull off than the other options. A pair of a large tank-busting species like A. Trimaculatus would be very cool in this size tank. Or a colony of cichlids of the same species, like maybe having 7x Nicaraguan cichlids with a bunch of swordtails, would be a beautiful display