In my tank (55g) I have these fish and a pleco...

Iodotropheus Spengerea (a little baby Rusty)
Labidochromis Exasperatus (my most expensive fish at 9 dollars)
Nimbochromis Venustus (I think he will get big)
Pseudoropheus Acei (the boss of my tank)
Pseudoropheus Kennyi (just a normal fish)

Is seems that everyone chase the little baby rusty fish... is this because
the rusty is a female, or is it because the rusty is the smallest fish in
the tank? I do move the rocks around trying to get the rusty hiding spots,
but whenever the rusty pops out to say 'hello', all the other fish go around
s/he.

Help