Definately take all but the clowns back,that sweetlips grow to 50cm in length,your just killing the fish now,where in the uk are you,and which store did you get them from,any chance of upgrading to a 200 g tank(thats whats needed for those fish without the sweetlip)plus I doubt your nano skimmer could keep up with the bio load in there.
Live rock in oxford cost £25/kg,
Old Chinese proverb:
Don't go to bed with ichy bum
wake up with smelly finger!!