Potential iron deficiency?

Just added about a tablespoon of worm castings. Looks like i might have a little nute deficiencies. My googling has made me think it is an iron deficiency? Just gave some water as she hasn’t had water for a few days and seemed a little dry. The plant is grown in foxfarm ocean forest and is about 3 weeks old. I’ve seen this yellow light green tint for a few days. Groth has always been slow so. Ph water is about 6-6.5 or so. I checked run off at 6.00 a few days ago. I do add calmag each feeding. I’ll be feeding nutrients this week at a low dose. I have not added any other than the worm poop i added a few hours ago. So this is straight fox farm ocean forest and cal mag. Any suggestions are appreciated. If cal mag is not needed i’ll leave it out going forward.

Water as needed .. keep going with medium - eventually you can just top dress more FFOF / water in to bump medium if starting to exhaust …..
Ridiculously easy …

Top dressing will begin to breakdown and supplement what it has lost over time / then you do the same method a couple weejs down the road.

Looks overfed to me.

It's highly unlikely that you have an iron deficiency. 6 is too low for pH if you're adjusting it that low. Don't worry about runoff pH. You don't need the calmag every watering