i have a 11 hydro ebb and flow system my plants dont look so well looks like phosphorus deficiency ph is around 5.5 ppm is at 1840 and the strain are bubba kush,sensi star,black damina,etc.
Bro, your running nearly 2k ppm's! you're bound to runinto deficiencies.. Maybe you should give em a nice leaching/flush and ease em back to full strength.
Remember less IS more.