Well i have my phosphates at .40 and used the gfo to get them down to .30 but after checking the rodi and salt mixes I have found no other culprits and think the rock is the problem . If i take the rock out and do a massive water change will this help also can i take from another tank that has no phosphate issues and use those rocks while my tainted rock is cleaned and put back in the qt tank for cycling ? I plan to run gfo and carbon what else can be done to lower the phosphates? any intel is appreciated.
Roger