Cyano isn't actually an algae. It's a bacteria. So wouldn't it be nonphotosynthetic? Also, when I started my tank, I didn't feed at all either, and the only thing I had was some green star polyps. I had the same thing, except it was green. It went away after a few weeks. I think that if your tank is so new, it's only to be expected that you will have some algae problems for a while.
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