Definitely looks like nute burn to me. As small as that plant looks I wouldn't go over 500 PPM just to be on the safe side.
dejayou30 Reviewed by dejayou30 on . some one plz help me i have no idea whats wrong with this i just flushed it and it worsened my ppm is running at 870 ph is between 5 and 6 temp is around 73 Rating: 5