I am new to keeping Cichlids so please bare with me. I currently have 8 various barbs and 2 firemouth cichlids in my 180 tank.. all was fine until recently were there is a significant dominance in one (ie chasing and the other hiding, no attacks or anything). Do I rehome one (I was told buying 2 was a good option), stick at it and see what happens or can I introduce another breed of cichlid?
Two is not a good number except when it's a mated pair. Generally unless kept in pairs Firemouths are best kept as a group of 6-8, but your tank isn't big enough for that. I think the only thing you can do is rehome one of them.