I use oyster eggs a time or two per week (usually just once/week). I use just a pinch each time -- not the full 1/4 teaspoon -- more like 1/16 of a teaspoon. I scoop a bit out with a knife. One container lasts me a whole year. I have also tried rotifeast and the corals didn't seem to like it as much. When I feed the oyster eggs I see polyps disappear like crazy -- all munching. I've had much better coloration of my stonies since feeding this more regularly. I sometimes feed it alone, but most often mix them in with some frozen cyclop-eeze, a squirt of selcon, and a little bit of seachem reef plus. I feed about 30 minutes before my last lights go off.
The oyster eggs put a bunch of nutrients into the tank, so that is why I don't feed the recommended amount. Maybe when my corals all get huge I'll up the dose.