Hard green algae

steve102571

Member
What type of hard, green, plate-like algae is carpeting the entire bottom of my tank? The substrate is sand and the algae is hard and about as thick as a credit card. The tank cycled approx 3-4 weeks ago. THis is a FO tank. Everything is zero, except for nitrates at is is less than 5ppm. I treied to mechanically remove some of it, but all it did was break and become imbeded in the sand. Should I vacuum?
 
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