Please help identify this problem

This is my first grow. Blue Dream at 21 days. Soil is FoxFarm ocean.Watering cautiously. Every 2 to 3 days to give soil chance to dry. Fiber 5 gallon pot drains well. No extra nutes given. Was all good until day 19. My best guess is lack of iron? PH was 6.5 to 7, now 6.5. Appreciate your advice. Because I was unable to upload a photo, I made it my profile picture. (where there's a will there's a way)

Hard to tell for sure.
It is so rare for you to get a deficiency in Foxfarm a few weeks into a grow.
Watering every other day is too much for such a young plant.
You want those roots to spread.
Ease up on the water.

Looks over watered. Don't water on a schedule. Water when it's needed. I've always done the lift test: right after you water a plant to where you get a bit of runoff, lift the pot. A couple days later, lift it again. You don't water until the pot feels almost empty compared to how it did when you first watered it.

In the beginning with a very small plant, you can even go without watering altogether and just mist the plant and top of soil with a spray bottle. When it gets some size to it and you first start really watering, you may only do it once every week to 10 days.

As the plants growth takes off though, it'll get to where your watering every other day.

Get your mind out of this "schedule" shit everybody talks about. It's complete bullshit. You do what the plant needs, not what something you read says your plant needs.

Thanks for your input!

I agree with the "scheduled" watering. I've been checking moisture levels with the "finger test". Only adding water when dry. I really think my culprit was the PH. I may have upped too much. My tap water's PH is 6.5. So my best guess from researching is I have an Iron lockout. Thoughts? Btw....one of the five plants is not affected.

6.5 is perfect. Leave that alone. The soil will take care of the rest.

TacoMac said:

6.5 is perfect. Leave that alone. The soil will take care of the rest.

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Thanks.