Alright guys. My tank has been established for about 7 weeks. In the second weed i had a huge break out of diatoms. I think.(brown algae that covered the glass and sand). It slowed down a little but im always cleaning my glass about every two days. Now today i come home and The brown algae turned green. What is this and how can i get rid of it. How many gallons a week should i be changing. And how many hours a day should i keep the lights on for. Thanks.