i usually put some flakes or brine shrimp in a small cup of water ... with and eye dropper just spray it in the feather dusters direction .. it will get some ... i think they are one of the coolest things .. have a great day
When my tanks were new, I used to feed the Kents phytoplankton, but now that the tanks are more established (and I am skimmerless) I don't do this anymore. They get plenty of food from the natural bacteria and such in the tank.
Good luck with them!