I'm thinking of putting 2 or 3 dwarf cichlids in my 20G long. Currently I have 6 white cloud minnows patrolling the tank. I'd like to keep them in there if possible. I'm thinking perhaps some Borelli Apistos or Bolivians, or some other hardy, small cichlid that can tolerate hard, relatively cool water. Ideally I want 77degrees or less. PH is around 7.5.