I don't agree with Tony here. I don't think it is a nutrient problem per se, but yes it is caused by a condition in a new tank that makes it favorable for Cyano growth. IME
every new tank will get it at some time or another. It is very annoying and Conches, or if unavailable Chemiclean will get rid of it. However, eventually tank conditions will not support its growth, and you will never see it again. I know I have not seen any in my tanks for a couple of years.
