I feed reefroids and Reef pearls
I feed in the morning before work. My lights are still out so it seems like the best time to feed. I don't do it every morning, just when I remember. About 3 to 4 times a week. Does it help? Well I can't say for sure but it doesn't hurt. And 30 bucks every few months isn't going to break the bank so I don't really care. I've tried Fuel, and all it did was make my glass really green, really fast so I stopped.
I target feed certain corals once or twice a week. Like my Anemone's and a few other softies.