Alien Moonrocks Autoflower

I would follow your feeding schedule from the brand of nutrients your using. They list if your Veg/Flower is going longer and what weeks to repeat to off set this according to their schedule. https://lotusnutrients.com/pages/easy-guide-and-recommended-hydroponic-feeding-schedule there PPM scale is a bit high though, use the ratios they are suggesting between grow : bloom, but dilute your overall solution. Also have to remember autos feed lighter then photoperiods. https://www.autoflower.net/forums/threads/med-man-method-feeding-chart-ppm-ec.47856/ This link is a good reference for how much to feed your autos in terms of PPM/EC, its not 100% so you need to look at your plants and if they need less or more adjust with accordance. The plant will show sex first with pistils, then stretch and go into flower. I would keep your grow nutrients till its mid way stretch then start mixing in in the bloom. Best Of Luck!

is it cold at night? even upper 60s F can cause fall colors or augment a plant predisposed to showing red or purple leaves etc... Think this is genetics and or environmental... i'd becareful of blindly boosting p/k. you can quickly lock out other nutes. it's worth doing the math on what you feed to determine ppm of p and k in total - even for a soil grow. you don't need p much higher than 50ppm and K shouldn't be too much higher than 200ppm. now, those are soilless/hydro values... in soil it depends on numerous factors and potentially want to add less than that since plenty could exist in the soil still. either way.. if you add p/k boosting nutes and see issues start afterward, good chance it is locking things out. make a little note to use a bit less on next plant(s).