They really do appreciate plants...real is better but they could also use fake. When my male is chasing the females, they will always seek shelter in the plants until they finally lose him.
For some aggressive species, you have to offer them something to direct their aggression to. If there are only females to harass, they will do that. And, as I said, my combination of more males than females seems to work fine with this species. These are no guppies, where sex trumps aggression. Here, it's the other way round.adding more males with just make things worse.. more females will give them extra distraction but this will also lead to more breeding.. putting them in the bigger tank and or giving them more hiding places will also help