I'm dealing with cyano right now on my new sand bed , and mine does the same thing , appears in the afternoon and disappears at night, which I'm pretty sure is totally normal as my previous tank did the same thing when I had cyano. Btw there is a big difference between 0 and .25 phosphates , so you might want to bring your water in to your LFS and have it tested or pick up a Hanna checker to get a more accurate reading.
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