Tell me about it! I think about going back to soil everyday lol! The growth in coco though is just awesome when it goes right. I ph nutes and check runoff every feed and I was at 5.8 on nutes and 6.1 on runoff, so I don't think it's salt build up and the burn started right after the first feed, which was with the mega crop. I usually use ro water and add cal mag, but I switched to my tap water since it was right at 150ppm. I didn't add extra cal mag though because I assumed the water had enough in it. Luckily it hasn't progressed to the new growth. I'll add another mil of cal to the water tonight and seen how she responds. Thanks for the help, it's appreciated.