Nutrient Schedule Question. When should I start feeding each of the three listed?

First girl is heavily overfed, second recovers and is way healthier, with that one, you have to start thinking about feeding. Epsom salt would help to sort magnesium issues, which it looks like starting on her. Count weeks and go with 1/2 strength of nute feeding schedule by manufacturer. After few weeks you can try to increase strength, that trio is very strong, used years ago fox farm. First girl dont need any food for 2 more weeks.

FOLLOW THE SCHEDULE! Treat autos just like photos. Feed accordingly. One thing you have to do is determine the "transition" between veg and flower. After that follow feeding schedule for flower. Adjust to fit the number of weeks in each stage. As to Big Bloom: main component bat guano. OMRI listed. Slurry like consistency. Harmoniously aids NPK emphasis on N. It is used from seedling to harvest. In SE Asia tribe people use guano tea in weed starts.

Keep using grow big for now, then slowly introduce big bloom and tiger bloom once they have small "budlets" forming. At this stage they still need the grow mix, giving any sort of bloom mix while still in veg is not really useful to the plants.

https://ilgmforum.com/t/fox-farms-nutrient-schedule-for-autos/39917 Here you will find specific opinions related to your question. Better results happen and knowledge is retained by keyword searching the 'net and youtube.

I'd buy a different brand of fertilizers, but you should be able to make just about anything work if it provides a well-balanced diet. Soil is all trial and error. if using something like FF ocean forest, you may not need to fertilize for several weeks. Watch for plant to show hints of deficiency, take not of how long that is to pre-empt it in future and slowly ramp up at that point. You supplement what the soil provides so it's a little at first then more later on. I'd start with 1/4 to 1/2 strength of instructions. Observe and adjust from there... take note of when you need to ramp up fertilizer over time and create a plan for future plants to pre-empt any symptoms in future. if you change soils, you have to re-learn that process. Different soil may have different starting content or different balance, so it may run out of things on a different schedule than Ocean Forest etc. I don't recall ff trio fertilizer having enough calcium, so you have to buy a product to add calcium to provide a complete diet. That was the first brand i bought and by my second grow i moved away from it rather than use up the bottles.

They have a feeding schedule on their site and directions on the bottle Id suggest starting their and then asking some more questions with a bit more details on your inquiry. https://foxfarm.com/feeding-schedules/ Their are a lot of unknowns still so start a diary and populate it with the data needed like medium and what they have been fed already or your likely to some burn. Fox farm feeds heavy, less is more.