The general rule of thumb is feed no more then your fish can devour completely in 5 mins or so and remove the left overs. Feed like that every other day and you should be fine. The anemones usually don't need direct feeding as they get most of their food from lighting, but it also depends on the species. The starfish will feed on detritus and left overs so no worries with him. Maybe someone can chime in about the scallops though as I have never personally kept any.
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