Phantom OG - Spiderfarmer SF-1000 x 2

A bit of a potassium deficiency but it doesn't seem to be getting worse since last week. I flushed the medium with 8 litres of water (PH 6.2) to remove anything that had potentially built up and caused a lock out and to make sure it was at the correct PH going forward. I'm carrying on with the Coco Bloom and FCJ and have stopped the PK boost and seaweed tonic and will see how it goes.