The LTA is on one side of the tank. Good. Move the BTAs to the other side. Encourage the black clowns to hang around the BTA side. Use the Eggcrate light diffuser if needed. Ths skunk has clearly chosen the LTA as its host. Need to get the others to accept the BTAs. Your best probability of success is to get them into their "territory" on opposite sides.
If you want to remove the PS, get the eggcrate. Create a corral in one corner. Herd the PS into it, then close it off and remove the fish.
Good luck.
Dan