heuerfan,
Personally I would not try to stock too many more fairys.
75G is not a big tank and you got one of the most beautiful wrasse out there, the C.lineatus is becoming more and more beautiful when you let it grow.
If I were you, I'd go for one or, if you must, then two more special wrasses different color and patterns from what you have there now ( I would'nt put C.rubrimarginatus for example).
Eight Line Flasher P.octotaenia would be a good choice .
I'd into them in the net after Q in seperate system.
Good luck.