Rust fungus or toxicity

Soil mix
3 parts happy frog
1 part perlite
1part Coco
1 part ewc
.25 part great white
.25 GHydro mineral magic
6.4 pH on runoff

Lights
4x4 envirogro t5 top mount
Galaxy hydro 350w led wall mounted

Temp
Daytime 70-80*f , 60% humidity rarely does it get above 75*f
Nighttime 56-65*f 40-50% humidity

Age
Day 33 from seed just received there first feeding

Water
Rainwater pH 9.5-10
Balance with gh pH down settled to 7.0
1 tsp Cal/mag
1tsp grow big
.25 tsp micobrew
Per gallon after about 10 minutes PH is stable at 6.2
Ppm 472



Currently in veg, Issue I'm having is i believe I've gotten rust fungus, im not 100% as I wonder if I may have burned them Ie soilmix/ nutrient feed any opinions/feedback/options.

I've removed the affected girls to a separate room, removed all the damaged leafs (didn't snap pics) about 2-5 leafs on two different plants all at the lower base area IE older growth, gave all a mild spraying of fungicide/neem mix, removed everything and thoroughly washed the main room with a tilex solution before setting it back up

Out if 30 there are 2 that showed these signs and are currently in isolation.

Sorry about the pics noticed new development this morning on the isolated planted, The damged area's i removed showed about 20% damage to the leafs of a orange/yellow spots
like in the pictures. Any feedback us appreciated. Thanks much.

Since it is old growth you know that it is a mobile nutrient (N,P,K or Mag) because it robs the older leaves to feed the newer ones. Cold nights is my first observation. Not on the margins so scratch K for now. Probably not N or P with those spots.
I would use 1tsp Epsom salt as a foliar Magnesium.

NaturalFarmer said:

Since it is old growth you know that it is a mobile nutrient (N,P,K or Mag) because it robs the older leaves to feed the newer ones. Cold nights is my first observation. Not on the margins so scratch K for now. Probably not N or P with those spots.
I would use 1tsp Epsom salt as a foliar Magnesium.

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Thanks for the feedback last week week an half has been cold yes. Had to heat my intake as there was snow outside and I worried about condensation an spike in humidity within the room. I'll give the epsom salts a try thank you for the quick reply.

I wonder why people chose cal and mag together? Gypsum for calcium and Epsom for mag. How often do people see cal and mag deficiencies together? Corps selling to the masses

NaturalFarmer said:

I wonder why people chose cal and mag together? Gypsum for calcium and Epsom for mag. How often do people see cal and mag deficiencies together? Corps selling to the masses

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Great point. I had a few freebie bottles a friend passed to me from his last grow. Cal/mag grow big and the microbrew. Been super busy with work and havent been ontop of my teas, or compost (my own fault) I usually use epsom salt for mag, and finely ground egg shells for calcium but the shells take along time to become available. I personally try to stay away from too many bottles ferts in place for top feeding, teas (kelp,ewc,guano,molasses, compost) and amending the soil a bit. In my case as far as feeding went They were free, they were there n ease of mixing swayed my choice of using bottled nutrients. Got a few days off to catch up on my compost and teas.