Yellowing again

Ok…5 plants were doing great, the biggest one is turning yellow but seems to be pretty much random leaves. They seemed to be yellowing
before I added nutrients. Im thinking it may be the light? The lowest plants look beautiful!! I just turned the hydro light down to about 65%. Ph should be good, humidity level fluctuates between 45-55% at any given time I think. Here are 2 pictures. I’ve been doing so good I don’t want to ruin them now. They are in day 45.

Here is another picture I just took.

when leaves yellow from the inside to the outer edges, it usually means calcium / mag issue. Cal/Mag is a good option for this ailment

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Tomorrow’s my day off so I’ll go to the store to get some thank you