Bottom leaves yellowing.

Phew, was sweating that something might happen to her lol. Last grow failed with a similar issue except yellowing kept climbing up the plant and eventually made most of the fan leaves drop so scared at the idea of going through that again as I'm using same strain / seed again. I'm still waiting on explosive growth but just not seeing it yet, not sure how to trigger it, it's been growing a bit slower since I last fed her and just watering with Rhizo in between feeds. Would you say this is the way to go ? Water > Feed > Water ? or will she be better off with lighter feeds all the time ?