A 4 month old tank is gonna have some kind of problems until you get everything into balance..your parameters may give an indication on how to correct it.
Phos and Nitrate have been 0 for several weeks now. Lights on 9 hours. I figure if anything I'm over feeding a bit.
I'm also wondering if the amount of cyano is really anything to worry about. What you see in the pics is about all of it. The stringy stuff has been there a couple of weeks now and really hasn't gotten any worse. I didn't pull it out because I wanted to see how it played out on it's own. I didn't notice the brown on the rocks until this week. I think I may cut back on the food a bit and not change any of the other things I'm doing unless I notice it getting worse.