What type of medium? Soil. What brand and type of soil? 2/3 Fox Farms Ocean Forest 1/3 MG Perlite. Indoors or outdoors? Indoors. What strain? Northern Lights How old are the plants? 7 weeks & 4 days. Day 24 of flowering. What type of lights and how many watts? 1 600w HPS. How far from the lights? 14-16" What is your watering frequency and source of water? Tap water allowed to sit for 2 days and adjusted to a pH in the mid 6's. See water/feed schedule below. What, how much and when was it fed? NPK? See water/feed schedule below. What is the medium/runoff pH and PPM if in hydro? Unknown. What are the temps and humidity in the room? 80-83 degrees daytime, 70-72 degrees nighttime. 39% @ 81 degrees. What size pots? 5 gallon. Any bugs? Look real close. Not that I can see. Any other pertinent info? See water feed schedule below. Switch to 12/12: 5/4/10. No nutes prior to 12/12. 5/4: Watered. 5/9: Watered & Fed at 1/4 strength. Tiger Bloom & Big Bloom. 5/13: Plant #1 flushed with 10 gal pH corrected water. 5/15: Plant #2 flushed with 10 gal pH corrected water. 5/18: Watered & Fed at 1/2 strength. Tiger Bloom & Big Bloom. 5/22: Watered. 5/25: Watered & Fed. Big Bloom @ 3/4 strength. Tiger Bloom @ 1/2 strength. Grow Big @ 1/4 strength. Plants were flushed because of suspected pH issues. Lower fan leaves yellowing & dropping. Upper fan leaves showing initial yellowing & browning. Starts near tips and moves back. Upper fan leaves showing numbers of small brown dots. No significant increase in flower/bud size in a week or more. See pictures. What should I do next? a) continue with standard water/feed cycle. Water on Saturday, feed at 1/2 strength the following Wed? b) Flush this weekend? c) something else? Thanks!