Although relatively new experience, my experience is similar to OrionN. I have a 150G 5ft tank, I have a mated pair of Royal Grammas (transferred from another tank and have been together almost 3 years). Added a trio of orchid dottybacks. At first the Grammas were puffing up, but all bark and no bite. After a day they barely take note of them.
Initially there was a fair amount of squabbling between the dottybacks, but that has settled. They were the captive bred from live aquaria and added all at the same time. The first couple days were pretty stressful to watch and I was sure there would end up being only one. They mostly swim together and are very entertaining to watch interact. Every once in a while for no reason at all one will go after another one, and there are frayed fins from time to time. The female was with eggs this week and it was fun watching the males try to flirt with her.
I have since added an exquisite firefish and midas blenny. The dottybacks did check out the blenny, but no aggression.
FWIW that was my experience with them.
Initially there was a fair amount of squabbling between the dottybacks, but that has settled. They were the captive bred from live aquaria and added all at the same time. The first couple days were pretty stressful to watch and I was sure there would end up being only one. They mostly swim together and are very entertaining to watch interact. Every once in a while for no reason at all one will go after another one, and there are frayed fins from time to time. The female was with eggs this week and it was fun watching the males try to flirt with her.
I have since added an exquisite firefish and midas blenny. The dottybacks did check out the blenny, but no aggression.
FWIW that was my experience with them.