It really doesn't matter what those tests say if it is Dino's. They feed on silicates and the only way to get rid of them is to completely stop all water changes and let the Dino's consume all of the silicates and basically use up the food source and die. It could take up to six months for this to happen. Been there done that.
I believe your thinking of Diatoms. Not dinoflagellates, which do not consume silicates
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