for sps these all need to be 0 and Alk should be 7-8. Ca 350
Not so. Sps do well in a range of 380 to over 500ppm calcium with alk at 7 to 11dkh,ime and that of others. Natural seawater runs around 400ppm calcium with alk around 7 dkh . and NO3 around .2ppm.NO3 is fine at under 5ppm or even a bit higher. PO4 at .05 does fine too.
Not so. Sps do well in a range of 380 to over 500ppm calcium with alk at 7 to 11dkh,ime and that of others. Natural seawater runs around 400ppm calcium with alk around 7 dkh . and NO3 around .2ppm.NO3 is fine at under 5ppm or even a bit higher. PO4 at .05 does fine too.