Hi!
The leaf color indicates nitrogen unavailability, but since it affects the lower parts, the pattern is typical for the flowering phase.
At the same time, it's already quite clear. I wouldn't do anything drastic. Check your watering routine and make sure the medium is always slightly dried out before watering. Then water evenly and rather slowly, in bursts. Definitely check the pH.
The plants have a lot of foliage, so it's clear that in the flowering stage, the older leaves are affected ;-).
Overall looks good, stay cool and no experiments now :-P!