When my tank was running (in the middle of getting a house right now) I fed daily. Not alot, just enough for the anthias to be happy. They are pigs.
If people want to use the stuff, and think it is working, more power to them. IME, however, it is an overkill.. Even on a new tank. You should not have any demanding corals, clams, or fish in a new tank. So, if you are patient with your selection and give your tank time, you'll see what I am talking about.
Most new reefers want imediate results. Heck we all do at times. They want a tank with color, and movement right out of the box. That just dosen't happen. So, they buy products that are a "miracle" in a bottle and hope it works. Some may see they notice a diffrence but I'll bet you a shiney quarter that if left alone, it would have been even better.
Also, as mac said, their are exceptions. As he said, small clams. The need alot of food in the water colum.
You would be much better off saving your money and investing in better lights or skimmer or other needed stuff.
wamp