I'm in the "Other" category. I agree with those who mention relying on a CuC. I'm going to get away from the original question just a touch, but feel it is on topic.
Having high or low nutrients in your system does not mean you are over or under feeding your fish. It is an indication of what the difference between your nutrient addition and nutrient export. You can have a high nutrient system by feeding a little and exporting nothing. You can have a low nutrient system by feeding heavy and exporting heavy. Feed your fish what it looks like they need to be healthy. Don't take algae into consideration, a little extra rotting food isn't going to matter.
As for algae, we want our system to be able to grow it. The requirements for growing algae are not much different than what coral needs to grow. In the ocean, a coral reef would quickly be overgrown with algae if you removed the clean up crew from it. The only time algae should be a problem is if we can't find a CuC member that will consume it. We can also try to force algae growth into certain locations, which is primarily what a chaeto fuge or reactor does. But.. if you are limiting nutrients to limit coral you are likely limiting coral growth, also.
