Is this for the 10g?I can only speak from my experience with honey dwarves,as I'm lead to believe some variants are more aggressive than others.Honey's are not too bad,I have 3 pairs in a 12.5g (pic in your other thread).
There's a bit of posturing,a bit of chasing,but nothing physical and on the whole they are a happy looking gang.
I have quite a bit of planting and wood in the tank,which I think really does help,some of the smaller ones will retreat and hide for a bit occassionaly,so I would say,yes,definitely go for more planting,also,the more hiding places that there are,the more confident your fish will become.