OK
That interveinal chlorosis you are seeing in the PA may be because of the 24/0 lighting and not a def.
If you up'ed your CalMag and did not notice any change, I would suspect that is why.
Some plants will show that under 24/0 especially if there is not much of a temp drop in the 24 hour period.
It should not be cause for alarm, unless you start seeing damage (yellowing, or browning)