Lapin thanks for posting that. I guess what I take away from that is although GFO reduces our phosphates it also effects many other elements like zinc, copper, manganese, cobalt etc. But not in a critical way.
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Before you jump in what is your nitrate number?My phosphates are at 0.25 ppm....should I run GFO?
Are your sps struggling?Ive been carbon dosing with vinegar also.. 10 ml/day
Some have browned out and some look normal.Are your sps struggling?