Mixing Clown species

[marcingo]

So I have heard and read that I cannot mix most clown species.

From what I have been told I cannot mix maroon or tomato clowns with smaller false perculas or skunk clowns.

Is this true?

Ideally I would like to have a black perc, yellow stripe maroon clown, orange skunk clown and a clarkii clown.

My tank is a 55 gal tank (4ft) and I was thinking of having one of each clown.

If I have one of each will they develop a sexual orientation if they do not have one yet? Would they be happy and healthy without others of their kind?

If I cannot mix all these species together which do you guys think I could mix (I have heard the black perc will be ok with the skunk and a false perc). By the way I realize the black perc is just a color varient of the false perc.

Also other than these I do not plan on keeping any other fish in the tank and would like to focus mainly on keeping a reef (mostly zoos, mushrooms, gsp, xenia, and maybe one or two pieces of hard corals such as a brain coral and a favia)

Thanks for the help.