Dear SPS reefer,
May I know how many of you are testing for (on top of PO4 NO3 PH KH):
1) Sr
2) I2
3) Mg
4) Ca
5) Potassium
cos I am thinking whether to buy 1) 2) 3) 5) testers or not... Also, the steps for testing Sr are like testing for DNA, I doubt how accurate it will be loh...