Curious if this looks like nute burn cold Temps or a phosphorus or cal mag deficiency? I just sprayed dr zzymes for russets
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Kinda looks like a cal-mag fix to me.
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I’l bet ‘Dr. George’ can make a house call and tell you…
@George? you here today buddy? what do you think…
Cheers
G
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I see the telltale cal-mag signs personally especially with the rust coming through, ya where is DR @George ? @Gpaw
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Paging Dr. @George , there’s a patient in need here sir 
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What can you tell us about your grow @Patriots781 ? What’s your medium/nutrients?
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1 plant or more? One strain or more? What is your in and out ph?
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peat moss not sure about ph,more then one strain
There’s a little tip burn. Making me think it’s a lock out due to bad pH levels now at the stage it’s in. What nutrients are you using? Are you ph’ing the mix when you water? How much have you been feeding them when you do feed them?
Sorry, being a bit disconnected, I would go for Potassium:
and this looks like pH swings:
I suspect some Iron def instead of Magnesium, it’s in the younger leaves and starting from the start of the leaf:
Do you check pH? Could be a bit high … 
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I’ve been dealing with russets,some knats, I have micronized sulfur,I’m about to use as a soil drench and then also foliar on the plants in veg does this micronized sulfur affect the ph much?
Also there a number of strains mostly indica Dom hybrids no cap sherb,jelly breathe,wizardry,platinum gelato,takeoff,hazelnut cream,blackscotti,rs11xsandra clarke and mtn trop cookie,I have the lights on 50 percent 24 hours a day there getting about 15k lux ,peatmoss mostly with Dr earth,I use some jackpot micronutrients blend has cal mag and every micro…It’s possible a little too crowded maybe more air circulation