Bottom leaves yellowing and dying

Hello this is my second grow and I’m almost to the flowering stage but I just noticed some issues when I transplanted them from 1.75 gallon pot to my 10 gallon pots. The bottom leaves seem to be turning yellow and dying and other leaves seem to be discolored, any help would be appreciated. I want to make sure they are healthy to move to flowering

Info:
Lights (18/6): VIVOSUN 650 watt
Soil: FFHF and FF ocean
Water: every 3 or 4 days
No nutrients
Temp: 70s
Humidity: 50s





Just the pH fluctuations and some nutrient burn from transplanting to different soil, I’ll bet. Wait until the more experienced growers chime in though. But thats what i am seeing. Start watering to 25%-30% runoff.

I feel with the lower leaves that is normal. I like to trim lower stuff so nothing is touching the dirt. Let them get going after the transplant. I think it will all be good.

It is normal for a plant to shed the lower leaves as it ages.

Lower leaves dying off is normal. However, one plant is showing a C def: interveinal chlorosis indicates a continuing dose of cal mag.

Is that the one in the OP’s 2nd photo?

Yes it is.

What product do you recommend to fix it?

Any cal mag will do the job.

I don’t currently use it as I am on the Jack’s program which contains C and Mg.