Is this a magnesium deficiency?

Hello fellow RIUers. Here I have four lovely AK-47 from Nirvana. They are in their 25th day of life and still vegging. I transplanted them last night from one gallon pots into three gallon pots. My soil mix is 50% FFHF and 50% FFOF. I also added 1 tbps of dolomite lime per gallon of soil, as well as about 20% extra perlite. My temperatures are steady between 70F and 75F. The pH of my water is around 6.5. I have not fed these plants any nutrients since they were planted.

Do you folks think this is a magnesium deficiency? The tops of the plants and branches (new growth) seem to be growing in yellowish, but I still see these "rust spots" on the leaves, making me think of a magnesium deficiency. I should also note that a couple of the leaf tips seem to be getting brownish/purple and brittle.

Any guidance appreciated, thanks folks!

NON-MOBILE ? deficiency....... You should start feeding them, they're ready for the nutes.

they are under fed start feeding! they look slightly over watered but this cld be from the recent transpsnt

Will do...I will wait for the soil to dry up a bit and will begin feeding. Today they will be 26 days old, should I keep it at about 1/4 or 1/2 strength, does it matter? I am using Alaskan fish fertilizer for veg and Morbloom for flower.

I started feeding mine at 2 weeks with 1/4 strength, they responded beautifully.

Since you've waited so long, I would say go ahead and go 1/2 and see how they respond. Might want to keep it at 1/2 next time, too.

Just an update to this thread.

It turns out the pH is real out of whack. I top dressed with 2 tbsp of dolomite lime for each of my 3 gallon pots (not enough, I know). And watered with some pH balanced water (pH down/sulfuric acid).

Two of them were male. One of the remaining females looks better than the other. I am hoping not all is lost. I will add 4 tbsp of dolomite lime next time I water to each plant.

sounds good. i think your females will be okay.

Some good info as well:

https://www.rollitup.org/newbie-central/16464-nutrient-disorders-their-related-effects.html