i recently started my first community tank and i have it stocked similarly to what you have planned for your tank. i have 6 neons and 2 female dwarf platies. i added a male guppy who thinks he is the "king" of the castle. they all get along fine with the exception of the guppy who loves to "harrass" the platies. he chases them and nuzzles them all day. (don't know whether he thinks they're his girlfriends!) they don't seem to mind!