Actually 1 is more than enough. The broko is the centerpiece of my community. I have my pair of bala sharks , pair of tinfoil barbs and an oscar. I like a varied community with the cichla as the headliner.
My plan is to go to a 180 in a year or so. That is possibly to small for the Broko alone.
if anything I may be unloading my mono very soon. The Broko is chasing him all the time and they have a tusslle here and there.