Just a thought, and I know very little about fronts at the moment, but what if you were to take out the male getting bullied, along with a couple of girls, and set him up with his own little group ?
Have to say though, as Ryan said, if they are breeding (hehe) then the maxim "if it aint broke dont fix it" may apply.
Doesnt answer the original question about why do people remove their alpha males though - i suspect there is a variety of reasons - some of the descriptions on TMe of fish being "alpha males" may not necessarily be all that accurate anyway - :lol: