So,,, apparently I have been using bad RO/DI water,,, I think,, I tested my phosphates in the tank Monday morning ,, it was 1. something,,, my Hanna Checker reagent was out of date,, I have new reagent coming in the next day or two,, I ordered Monday morning after that test from BRS ,, priority mail,, Testing with the out of date reagent,, I am not sure wither my water is bad or not,, but,,, I replaced all my RO/DI filters,, I replaced all my Top Off tank water,,, its a 17g container, dumped my 25g of reserve RO/DI water. I made 20g of new saltwater water yesterday morning for a water change ,,, I did that water change yesterday evening when I got home from work. I had changed out my GFO in the reactor last week,, I had put 3/4 of a cup in the reactor,,, When I get the new reagent in,, I will retest tank water again and test the water coming out of the GFO reactor,,, I will also change out the GFO in the reactor after the test,, I lost two SPS frags,,, and another SPS or two have lost some encrustment around the frag,,, other SPS corals are doing good,,, My question,,, how often and how large of a water change should I be doing? I have about 150g of water in my system,,, Should I increase that 3/4 cup of GFO I have in the reactor or stay the same? Is there anything else I can be doing?