Deficiency???

Starting week 5 today, and it's been going great. Trainwreck auto. This morning I noticed a slight color change in a leaf and its starting to spread to other leafs and a few main tops on very new growth but its stayingat top of canopy. I'm in fox farm ocean forest soil, in 3 gallon fabric pots, only have been watering with rain water mixed with great white mycro and liquid seaweed from blue planet nutrients. water ph has been 6 to7. Soil ph is reading 6.8. I top dressed 2 tbsp of both dr earth home grown and flower girl yesterday but might of needed to last week seeing this happening now. My night queen auto is next to her and shes doing fine She is getting the same exact treatment but no deficiency in her yet.