I'm growing Purple Kush and Pineapple Express in DWC. The PK is a few weeks older than the PE. I'm growing in a 5 gallon tote in a 3.5x3.5x5'6" tent. I'm using RO water and Dutch Nutrient Formula Gro A and B. My ph is 5.6-6.3 as it rises every few days I Ph down. They are growing under an LED Mars300 for the time being as they are still small. Temperature is 25 degrees Celsius during light period and 17 during dark period. The light was 24" away and I've since moved it up to 33 as a precaution. I'm uploading photos, can anyone help? These were expensive seeds. Also note, the damage started 2 days after first feeding at 1/4 strength.