Not the easiest question to answer simply, as like with many things, it depends.
Most filter-feeders do require daily feedings if not even more frequent than daily. Luckily most things we keep aren't strict filter feeders. The biggest exceptions I can think of are non-photosynthetic gorgonians, sponges, and so on. The downside to feeding this stuff daily is that you have to be careful not to spike your system (which is VERY easy to do IMO).
Most facultative corals benefit from feedings but do not need daily feedings. In this case perhaps once a week is enough. The trick is observe your creatures and observe whether they exhibit a feeding response. If they grow and do well, then by all means, feed more, just be careful about not overdoing it. If they don't react and don't grow, then don't bother.
So basically once a week, maybe more, maybe less, depends on what you have that eats the stuff.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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