Lemon Skunk Flowering! Newbie needs help!

I am in my second week of flowering. not sure what to expect but the flowers seem to have appeared very quickly, but may have slowed in growth the last two days.
I use Canna Aqua and follow "dosages" as close as i can.
I keep my PH between 5.5-5.9...usually 5.7
Use 5 gallon bucket for plant, connected to another 5 gallon I use for reservoir. have a small pump set on a 15 min, every 2 hour feeding schedule. The plant bucket drains into reservoir about 2 inches above liquid line so I believe the "splashing" of the falling water creates the necessary "air circulation" needed within the solution. Not sure if I'm correct on this and hope for some feedback. I also wonder if i still need to have a weekly "flushing" of solution.
i know that mobile nutrients begin to wander where needed as flowering progresses. I understand that yellowing is normal and expected. It is just that I'm new at this, and I am curious if what I'm seeing in my plant is normal as I have no reference point.
Any help is GREATLY appreciated. Thanks!