Leaves turning red/purple

What is happening to this plant?
Leaves are changing color.
Can anyone help?

It's in soil, my own mix. 50% top soil 25% perlite 25% peat moss
3 gallon cloth pots.

450watt viparspectra led
Another 250 watts of 2700k led

Was feeding miracle grow 1/4 strength
Cut back miracle grow, changed to Schultz plant food 1/2 strength when I switched to 12/12
Just started tiger bloom 1/2 strength
Lights were at 12 inches.

Temps sitting around 83 and 74

They are 23 days into flower

I also fed Molasses 1/4 tsp and a couple drops of superthrive about 3-4 weeks ago

I think it's a micronutrient deficiency, possibly molybdenum. Good luck.

simpleleaf said:

I think it's a micronutrient deficiency, possibly molybdenum. Good luck.

Click to expand...

Thank you. I flushed them out.
My runoff ph seems to be sitting around 6.5.

Just lack of food in general.Shes hungry.

myke said:

Just lack of food in general.Shes hungry.

Click to expand...

Thanks, sure hope so.
I haven't given anything full strength, out of fear of overfeeding.

Feed them. Looks like the beginning of P deficiency.

So the purpling is caused by P def.?

Hollatchaboy said:

So the purpling is caused by P def.?

Click to expand...

Ya. P deficiency will cause purpling. When people do cold climates to bring out the purple's, it's basically a slight P deficiency in a way. But purpling is also genetic. Cold temps make it harder for the plants to access the P.

Those buds look like they're in peak flower so they're demanding lots of P right now.

Thanks guys. I will give them a nice dose as soon as they are ready for watering.

Wvman020 said:

Thanks, sure hope so.
I haven't given anything full strength, out of fear of overfeeding.

Click to expand...

And yet you flushed them. Lol.

hotrodharley said:

And yet you flushed them. Lol.

Click to expand...

Yes, I had someone come look at them. They believe it is the start of a lockout.

I'm going to flush then again.
Then hit them with a high P feeding

Wvman020 said:

Yes, I had someone come look at them. They believe it is the start of a lockout.

I'm going to flush then again.
Then hit them with a high P feeding

Click to expand...

Oh excellent. Another flush.

hotrodharley said:

Oh excellent. Another flush.

Click to expand...

Yeah I'm gonna feed plain water for the next couple feedings. Then introduce nutrients again.

hotrodharley said:

Oh excellent. Another flush.

Click to expand...

Do you have any suggestions?

Wvman020 said:

Do you have any suggestions?

Click to expand...

First, stop flushing. Next try a half strength feeding and wait a few days. No more Miracle Gro. Look for a lower nitrogen feed.

Thank you.
Right now i have a 10-15-10 and a 2-8-4. Should I find something better?

hotrodharley said:

First, stop flushing. Next try a half strength feeding and wait a few days. No more Miracle Gro. Look for a lower nitrogen feed.

Click to expand...

Also, can I ask about proper flushing?
I have 3 gallons pots, I ran a little over a gallon thru. With maybe a quart or so of runoff.

Wvman020 said:

Also, can I ask about proper flushing?
I have 3 gallons pots, I ran a little over a gallon thru. With maybe a quart or so of runoff.

Click to expand...

You’re asking the wrong guy about flushing. It’s a fool’s errand.

I always water to a about a quarter runoff.
Idk if that's normal practice.