My carbon and GFO come from BRS. Both were purchases a year ago, the GFO is the regular granular and the carbon is fine lignite.
I believe that over depletion of nitrate and phosphate was the case too. However I do feed my tank heavily. 1/6 nori sheet daily, Formula one pellets 3 times a day (amounting to 1/2 tsp I think), a cube of PE Mysis 3 times a day and a 1"x2" slab of silversides or krill every second day.
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