It may work temporarily, but definitely not long term. Space can help, but eventually their true colors show up.
To give some perspective, I take care of an 11' 850+g tank. The owner wanted a handful of ryukyuensis wrasses, but there are also a dozen other species of fairy wrasses. We figured the massive size would help overcome any inherent squabbles. They coexisted well the last 3 or 4 years, a semblance of working out. However, since the new year the dominant male's aggression has gone into overdrive. He has killed two other males and everytime he sees the third he forces it into the rockwork, even when he is on the opposite side of the tank.
A 150g is not nearly the same size as that tank. In this case, I would be surprised if you still had all the rhomboids still in a year, let alone five or more years, which is still not the entire length of time to expect to keep them in captivity.