ok.so,my friend just finished a grow with some photo plants grown in coco.They were amazing,really tight and packed buds.He went on 12-12 from start to finish with coco,only with water.....water with 7.5 ph.How is that possible ? coco has no nutrients and still the plants finished with great results.He said that the harvest was the same as last time,only the last time he used nutrients.wth?how?