How often would you target feed feather dusters?

[Porcupine Reefer]

I know that these guys only eat live food, I am going to get live phytoplankton or any other filter feeder food but how often would you target feed them?

 

[MarineandReef Jaron]

I have never target-fed Feather Dusters. While they are nonphotosynthetic they do not require the same attention as do nonphotosynthetic corals.