Hey all, I am pondering what may be going on microscopically with my reef. Heres a little background, I started my 20 long with refugium and skimmer 11 months ago and made the mistake of adding the macro algae too early. Because of that mistake I fought low nutrients and dinos until month 5 or 6 when I pulled the macro and let the nutrients raise to 15ppm no3 and almost .5ppm po4. I then started doing 20 percent water changes and my average measurable nutrients are 5-10 and .03-.1. I have been removing GHA and cyano ever since. I vacuum the sandbed regularly and have a lot of sand moving flow. The corals and fish look and act healthy, not merely surviving. I am thinking the low nutrients early on slowed the maturity of my biology and am wondering what more experienced reefers think about that thought and how to remedy the imbalance of beneficial and nuisance bacteria. I usually research these answers for myself, but have not found many good articles on this subject except for the sites that are trying to sell me snake oil. Any advise would be greatly appreciated. Thanks for reading.