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Highly doubt it's diatoms in a year old tank unless you've added sand recently. Looks more like cyano to me, increase flow and decrease nutrients and it'll go away
Interesting you say that. It's a 70 gallon tank with one tang fed one cube a week. If I lower nutrients anymore he won't get fed! I've read reviews that certain people have had problems with certain salts so I'm considering changing that
First thing I would do is try getting a little more flow in those areas. And you don't necessarily have to reduce feeding, but you probably want to do larger wcs