Man, are Benggai temperaments really that different from Pajama's? I don't get Cardinal Fish very often... 20 something years ago when I started my first FOWLR tank I had a single Banggai and he seemed peaceful enough, I don;'t really recall any aggression from it. Fast Forward to my daughter's tank, she wanted Cardinals, so we opted for 3 PJ's, and they are super peaceful in her tank, they don't bother anyone, and in fact, the orchid dottyback darts out and spooks them every once in a while, they seem super meek.
As Roatan and Santana said, Dottybacks are cool, but they are more aggressive... about the same as the Flame Hawkfish really, I like Dottybacks so much my daughter and I both have one in our respective tanks. Hers lives alongside 2 clowns, a lawnmower blenny, a hector's goby, 3 PJ Cardinals, a Blue Cleaner Wrasse and a Skunk Cleaner shrimp.
Mine lives alongside 2 Oscellaris Clowns, 3 Blue Chromis, a Rainford's/Court Jester Goby, and a Banded Sleeper Goby. I'll be putting in a Tomini Tang, and a McCosker's Flasher or Melanarus Wrasse to round that tank out. This is the tank with the Flame Hawk, but he's being traded with the LFS for some coral just because of how aggressive he gets, he's currently in a breeder box in the tank.