Abel's first grow, Gorilla Cookies Autoflower

Day 15: Plants still yellowing on edges, burnt tips. Watered each plant .25 gallons with Athena Grow(24ml/g), Athena Core(15ml/g), Raw Silica(1/8 tsp), Dextrose powder(1 tbsp) and Calmag+(3.5ml/g) at 6.7 ph began plant therapy spray daily. Day 16: No water needed. Plants are unchanged, no additional yellowing/ends burning. Perhaps good? Day 17: Watering each plant .25 gallons with Athena Grow(24ml/g), Athena Core(15ml/g), Raw Silica(1/8 tsp), Dextrose powder(1 tbsp) and Calmag+(3.5ml/g) Day 18: No water needed. Plants seem to be getting more green Day 19: No water needed. Day 20: Watered each plant .2 gallons of 6.6 ph water. Day 21: Plants seem to be recovering, no water needed.