I've tried feeding my adult fish microworms. They would just swim around like "I know he put food in here, where is IT?" lol I have also tried with baby guppies. They seemed to enjoy for about 2-3 weeks before they just lost interest. It appears all of mine prefer BBS.
I have 3 cultures going ATM. 1 in oatmeal and 2 in instant mashed potatoes. One of each kind are kept in the fridge while the other is sitting on my window sill for faster growth. I was paranoid my culture would crash so I divided.