There is no need to feed it. As long as you have good light, and an established tank, it will get everything it needs from the water column. These are very rudimentary creatures that, in the wild, have no-one coming by and dropping mysis, silversides or anything else down their gullets. These creatures actually require very little care and even thrive in "dirty" water. Broadcast feed your tank once a week and that is all it needs. I have quite a few in my tank no and I NEVER target feed them and they are absolutely thriving.
The less interference from you, (hands in the tank, etc.) the more the livestock in your tank will thrive.