Wow! I should have looked here sooner!
I changed my mind a bit, In the 180 Im going to have one black arowana, three p-bass (one mono, ocell, azul,) and a clowknife.
So in the 375 there will be the black aro, three p-bass, and the CK. Im also going to try and introduce a silver arowana, if any fighting occurs between the black and silver, the silver will be removed.
I'll probably do dats in another tank though.