Help a newb out. Magnesium?

Leaves are looking funky. Magnesium deficiency happening?

Mars Hydro TSL 2000 (300watt) hanging 24 inches from canopy at 100%
Plant is 4 weeks old from sprout. Strain: Dr. Seedsman CBD is 80% Sativa
This plant has been topped twice already and the most recent topping was approximately 5 days ago.
Growing in FoxFarm Happy Frog and I have not added any nutes thus far.
Water is always dechlorinated and PH'd between 6 and 7. (PH of run off around 6)
Pots are 2.5 Gallons and I water about half a gallon when soil is dry (knuckle & weight test)
Temp anywhere from 75-81 F
humidity 50-60%

No need to ph your water unless its some un drinkable stuff.Epsom salt is cheap,1/2 gram per gallon I think is about right.Warm water first to dissolve then cold.Foiler will also work but less then a feed mix,a pinch per 500 ml is about right.
you could probably start a light feed with some well balance fertilizer,this should help.

myke said:

No need to ph your water unless its some un drinkable stuff.Epsom salt is cheap,1/2 gram per gallon I think is about right.Warm water first to dissolve then cold.Foiler will also work but less then a feed mix,a pinch per 500 ml is about right.
you could probably start a light feed with some well balance fertilizer,this should help.

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Great thanks myke! I do have some cal/mag on standby. Would you recommend epsom salt over the cal/ mag?

mrjustinkgarrett said:

Great thanks myke! I do have some cal/mag on standby. Would you recommend epsom salt over the cal/ mag?

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No calmag required if using tap water...try raising the light 6 inches.
Should not need feeding yet, but maybe a light batch of HF.
I use the same soil, tap water...you need a better ph methodology than guessing between 6 and 7.
You want to stay on the top side of the scale in soil..6.7 to 7.2. As it dries, the ph will swing lower, giving a good swing for all elements to be made available.
Peace.
FF

FastFreddi said:

No calmag required if using tap water...try raising the light 6 inches.
Should not need feeding yet, but maybe a light batch of HF.
I use the same soil, tap water...you need a better ph methodology than guessing between 6 and 7.
You want to stay on the top side of the scale in soil..6.7 to 7.2. As it dries, the ph will swing lower, giving a good swing for all elements to be made available.
Peace.
FF

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Roger that. I appreciate the help thank you