Blue Dream Indoor Summer 2019

The plants are still growing a bit slower than I’d like but look healthy enough overall to me. Added better ventilation today to hopefully improve air quality and lower temperatures. Hoping this helps growth rates through the next week. Some of the leaf tips are looking nutrient burnt still. I flushed all pants with sledgehammer and distilled water a few days ago. Waited for them to dry out and gave them a dose of nutrients again. Tried to go easy on them but maybe it’s still too much. Plants are looking a bit healthier after flush though. Seemed to have a growth spurt. Gave the plants a light defoliation from underneath and have been continuously removing small suckers here and there that are too far below the canopy. Seeing some yellow spots and yellowing edges on one plant. I’ve been checking soil PH every couple days, and things have been sitting between 6.3 - 6.8 through the week. Lost track of watering volumes, but I’ve been trying to go lighter since the flush. Any tips or ideas on what could be causing and remedy these yellowing leaves are very much appreciated! Thanks for taking the time to read all this.