Flushed all plants with about 20 litres each (2ml Canna Coco A+B per Litre, along with 1ml per Litre of Cal-Mag) at PH 6.0.
Run-off looked dirty, so i flushed till they were all clear, i seem to have lost my PPM meter so couldnt get a reading on that, but i can assume flushing them should solve...