Need a flush? Need more nutes? PH issue?

[Craigson]

Is this phosphorous or ph issue? Or something else?

2xBB in 1/2 Promix HP and1/2 Promix BX w added perlite n worm castings n dolomite lime.
NFTG sample kit nutes + ca/mg a couple times.
Been feeding at 6-6.2ph, havent tested runoff
Temps are 28C lights on and 19C lights off
7-1/2 weeks veg, transplanted from 3gal to 10gal 5 days ago(purpling started about 5 days before transplsnt)

Had same thing happen on 2 clones from same plants but They went pretty dry for a day and got water only (ph'd) by my wife when I was away for a few days. It corrected when I fed it next, all new growth was fine and didnt get any worse on affected leaves.

Now over the last few days the big plants are going purple. Ive been going feed, feed, water for the last 2 weeks since I was away.

Note**one plant does have minor 'clawing' on newer leaves but no burnt tips or anything

Thx in advance

 

[Bugeye]

Not a ph issue and you don't need to ph your water, the soil will buffer it to the ph of the soil. This is likely nutrient antagonism, reference Mulder's chart below. Good luck!

 

[Craigson]

Not a ph issue and you don't need to ph your water, the soil will buffer it to the ph of the soil. This is likely nutrient antagonism, reference Mulder's chart below. Good luck!

Excuse my ignorance.
So what steps do I take to fix this?
Too much cal/mag affecting my phosphorous uptake? So stop giving cal/mag?

Or should I flush ?

Thx

 

[Bugeye]

Yeah, stop the cal/mag, usually not needed in a limed soil. Not sure about your feed schedule, pic of the whole plant may help get better recommendations.

 

[Craigson]

Yeah, stop the cal/mag, usually not needed in a limed soil. Not sure about your feed schedule, pic of the whole plant may help get better recommendations.

Ive been going feed, feed, water.
1/2 gal every other day

Would over or under watering possibly cause my issues?

 

[Bugeye]

Ive been going feed, feed, water.
1/2 gal every other day

Would over or under watering possibly cause my issues?

Unlikely you are underwatering and possible you are overwatering. Yes, overwatering would contribute to your issue as it means more nutes over time which build up in soil.

 

[Creature1969]

Ive been going feed, feed, water.
1/2 gal every other day

Would over or under watering possibly cause my issues?

Ya, this isn't helping much. Let the pots dry out until they feel almost too light. Drench the soil completely and water until you get 7-10% runoff. Repeat.