Ok. Just try to remove any mold without damaging the roots, a few days shouldn't be too bad.
A ph of 7 is a bit high. Personally I would use unused coffee grounds, but I've never had the opportunity to fix ph issues. Maybe adding a little bit of lemon juice to your water? If you search ph in the indoor growing thread there'll be people who have more knowledge/experience growing in pots. I know there are products to adjust ph, but you might need to go to a hydroponics store to get them, and they may be expensive.
The FF nutes, what are the NPK ratios? They should be on the front of the bottle. A higher N is used during veg and some people use it for the first week or two of flower. A lower N higher PK ratio is used for blooming, usually when the stretch is over and the flowers are starting to form.
For autoflowers you don't need as much, they're sensitive to overfeeding and having a nutrient solution too strong can burn the roots.