Help identify deficiency

Hi,

Tent 2 X 2.
2 plants in soil.
On the left, Blue Dream.
On the right, Critical CBD.
32 days since flip (12.12.2020)

The CBD has less buds but has no deficiency.
The Blue dream shows some.
They are on the same menu:

The soil is mix ready from the gardening store with some humus (12%) I added, perlite etc

I am feeding the same nutes for both:

Cal mag extra
Bio Nova soil super mix
Big Bud

Water are tap water 6.0 PH ( the run off is about 7)


I have some spots that I suspect its calcium deficiency.
Also in the last few days, the tops of some of the buds are a bit purple, looking strange.
I moved the light 10 cm up, now its about 50 cm from the buds.

I am trying to understand if I need to add more to solve it?
Does the two symptoms connected? (spots and bud tops purple and thin)


Some spot I had, now its better, but I would love to hear what it is, Is it calcium?



My super crop was good this time:



This is the CBD - she is doing great same conditions


Some of the blue dream buds tops are with this strange color and this is new effect that I would love to hear opinions.


Photo with no flash

.....Tap water.

How much PH down are you putting in a gallon?

Beehive said:

.....Tap water.

How much PH down are you putting in a gallon?

Click to expand...

Looks like low PH from here. Water source please?

Beehive said:

.....Tap water.

How much PH down are you putting in a gallon?

Click to expand...

About 6-8 drops, depend on the feeding, if full nutes or not.

Actually I switched to RO water for 3-4 watering and then got back to tap water after the spots started even that I gave cal mag almost every watering.

RO water are better? I don't know any more.. most of the guys I know that grow in soil don't even adjust PH...

MICHI-CAN said:

Looks like low PH from here. Water source please?

Click to expand...

I use tap water, standing for 24 hours before watering.

The run off is 7 -7.2, so I am giving 6.1-6.0 water.
Not good?
Can it be that I don't need to adjust ph at all?
The water after adding nutes are 7.0~ ph (before I apply ph down)

PH the water after mixing fertilizer.

WeedLover487 said:

About 6-8 drops, depend on the feeding, if full nutes or not.

Actually I switched to RO water for 3-4 watering and then got back to tap water after the spots started even that I gave cal mag almost every watering.

RO water are better? I don't know any more.. most of the guy I know that grow in soil don't even adjust PH...




Tap water, standing for 24 hours before watering.

The run off is 7 -7.2, so I am giving 6.1-6.0 water.
Not good?
Can it be that I don't need to adjust ph at all?
The water after adding nutes are 7.0~ ph

Click to expand...

My remedy would be ph to 6.4 -6.8 at this stage. A spritz of 1/4 Tsp epsoms salt in a quart of water will slow the purpling effect till Ph correction catches up. But my opinion is all.

Beehive said:

PH the water after mixing fertilizer.

Click to expand...

Sure, this is what I do, edit my comment to be clearer

The most likely solution to your problem. Is the PH has to be raised. There's many ways to do it and the choice is yours to which one.

Age the fert solution for at least an hour. Stabilize it and confirm before you use it.

Beehive said:

The most likely solution to your problem. Is the PH has to be raised. There's many ways to do it and the choice is yours to which one.

Age the fert solution for at least an hour. Stabilize it and confirm before you use it.

Click to expand...

And you care about the run off water?
I gave 6.5 ph before, but I got high run off... 7.5+
So I thought I should adjust....

So back to 6.5 now, ok thanks I will update.