I have had a 135 up and running for about 2 weeks now and i have been checking my levels and everything has come down to 0 except for my Nitrates which are reading 10ppm. i also have the brown algea on the bottom and the rocks that i have had before when cycleing tanks and was wondering if it is good to add fish now that i have had from my 90 gallon. also is there a way to get rid of the brown manually or just let it run its course.