ill be "that guy" woody,
to the OP.. your gonna have a blood bath on your hands, 4 clowns in a tank that small is risking the loss of the weaker pair and no one wants to see their fish get beat to the point of death.
i would rehome 2 of those fish, which ever 2 is your choice, i would keep the brighter more active pair but thats just me, and you can risk it as well, but IMO 4 in a tank that size is asking for trouble.