Use test kit values as a guide for how things are going over time, not an absolute value to aim for. Test kits have questionable accuracy, so chasing the "ideal" numbers will be problematic.
... are a highly developed grazer of the reef. With strong calcified, fused teeth that scrape off coralline algae and the calcareous surface that most algae live on. They are one of the major sources for the fine calcareous silt found around a reef.
