Acaras and Angels will, not sure about Acaras and rams......maybe if you have adults or pairs of Rams and the Acaras are smaller....a breeding pair of Rams wouldn't take no guff, but idk about loners vs. most Acaras. If you do, I don't think I would keep Blues or EBAs on my list. Maybe Yellows or Ports or smaller. Heckel's can get nasty I've heard too. Angels are just so much bigger and have a more menacing appearance than Rams...Rams have attitude but get screwed if someone calls their bluff cuz they really are NOT fighting fish....and the fish they CAN stand up to are all built lighter-bodied or simply don't have territorial issues. Angels, Yes, Rams, No.
Only way I could see it work for Angels/Acaras/Rams is possibly a tank of all one sex.......IMO, female better.
Ive got 6 rams which ive had for about 6months and none of them have paired off yet so I assume they are all the same sex. If I get one blue acara would it hassle them? If so then maybe ill go for a keyhole

