When dosing yeast to combat diatom algae I use approx 1/4 teaspoon every other day for 5-7 days or until I don't see diatoms anymore. I simply add the dry yeast into a high flow area of the aquarium. While I was very careful in measuring my dosage the first time I was a little more liberal with repeat doses.
I do not know exactly why this works but it has worked well in many of our store systems, it has worked well for a wholesaler we frequent, and it has worked well for many of our customers. Nobody has had or mentioned any bad side effects to me. I'm confident enough about this method that I wouldn't think twice about adding it to our 800 reef or farm systems that house our most prized corals.
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