Hi All My tank is 5 months old now. Hanna checkers show 12 for nitrate and 0.2 for phosphate. I have some GSP which seem to be fine, a few zoa frags which are mostly growing and a few cheap SPS frags which are looking a little brown but some are ‘greening up’ a little. Any thoughts would be most welcome. I have a little Rowaphos in the media basket under the roller mat. Many thanks.