I've owned a trio of Red Saddled (P. flavoguttatus) and a trio of Borbonius, a single Lyretail and a Sunburst.
The Red saddled were nasty to each other. It's the first time I've ever seen fish jaw lock in my tank. The mouth of the smaller one was damaged and he probably only lived a year after that. His mouth was stuck open. I separated the remaining two and that's when they became super timid. So, they were nasty to each other, but afraid of everyone else.
The Borbs had their hierarchy and no one crossed the line. So there really was no fighting. We had to watch the girl on the bottom of the totem poll during feeding, to ensure she got her fill. I used to hit the male with the feeding stick. He would steal big hunks of food intended for the lions and scorps. He was so fast. They are a very bulky anthias, when they grow up and can stand their own.
The sunburst looks much like the borbs as far as body shape. That's probably why she did not fit in with them. She did not have the personality to fight for her spot, so I had to remove her. Such a timid fish, so that she was even afraid of the seahorses.
And our bestest ole girl, the lyretail. She was a beast. She had all the other chicks cowering in the corner at the LFS and went through 2 men in her 8 years. After the second male died, we never tried to pair her again. Oddly enough in about year 5, she grew an elongated dorsal fin, like a female does in the presence of other chicks and no male. She had been alone for about 4 years at this point, so we don't know why she was trying to go "male" on us. She would sit in our hands to get food.
I did not feed them multiple times a day. If I had a few cubes in a dish, I would go around and put little bits in the tank at a time. That's to make sure they eat it all and it doesn't get down in the rocks. I didn't feed them differently than my other fish..... well, my other normal fish. None of mine were picky.