Is This A Calcium Deficiency? Newbie

[IOPBlazer]

Hi guys/ gals,

Here are the details so I don't waste your time reading
*2 Plants - Blueberry Auto and Purple Haze Auto
Using Bio Bizz Light Mix soil, 3 gallon smart pot, LED grow light, 60x60x160cm grow tent
Temperature - 79-82F and Humidity - 57%-62%

First watering - 5.6 PH table water (was still learning)
2nd watering - PurpleH - 5.7 PH water, run off 6.3 PH
- BlueB - 5.7 PH water, run off 6.4 PH

2 days ago - Fed the plants for the first time Blueberry @ 21 days, Purple Haze @ 17 days
Used: 6.6 PH water and 1/8th of dose of Atami B'Cuzz Soil A + B.

Today I woke up to these yellow coloured leaves, the purple haze is doing well as it has only 1 leaf discoloured but the blueberry has 3, not many but it worries me not knowing what the problem is..
(Photos are 1 normal followed by a close-up)

Purple Haze Auto:

Leaves PurpleH:

Close up -

Blueberry Auto:

Leaves BlueB:

Close up -

Leaves 2:

Close up 2 -
Blueberry 2 (close up) by JohnCatman

 

[HappyHour]

Have you been spraying them with water or foilar feed?

 

[Gee64]

Your ph is too low for soil. get it up to 6.5 or 6.6.
Here is a chart to show you at what ph levels each nutrients gets unlocked. at 5.5 you have some nutrient lockout.

you can see the broad spectrum of partial lockout occurring at 5.5