Having some problems need help

Hey there everyone I’m new to the forum and just started my first indoor grow 4 wks ago. I’m having some deficiency problems or so thing my leave started to fade and the plants just look down. There’s a few burnt looking spots I’m using straight phd water every other watering and have the recommended dose of nutes.maybe a magnesium deficiency or the half dose is still to much for them and I’m burning them? I appreciate any help I can get that’s a lot.

Plants look fine now; maybe beginning N excess.

Do you have a digital PH and TDS meter? Are you using them?

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  • What strain, Seed bank, or bag seed
  • Method: Soil w/salt, Organic soil, Hydroponics, Aquaponics, KNF
  • Vessels: Pots, Grow beds, Buckets, Troths
  • PH of Water, Solution, runoff (if Applicable)
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  • Temps; Day, Night
  • Humidity; Day, Night
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  • AC, Humidifier, De-humidifier,
  • Co2; Yes, No

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Strains are
lost coast hash plant Humboldt Fem
Sour blueberry Humboldt Fem
And a romulan unknown From a female mother that don’t know the origins.
All from clones buddy bought at a seed bank.
Grown in soil pro mix premium
3 gal plastic pots
Waters been used between 6.2 and 6.4 PH I haven’t checked the ph of the run off. There has been any there drinking about a litre ever other day. And there is minimal run off. Just started check ppm a last watering it was just straight ph tap water 6.4 ph and ppm was 310.
Indoor in a 4x4 tent with 2 mars hydro ts 1000. Day temp is 78.5 with 52-55 humid.
Night is about the same. Grow is in a basement bedroom. Running 4 inch carbon culture with a 4 exhaust fan and a 4 inch intake fan. Only house ac but it holds temp good. 72 outside tent and 78.5 inside plants are in veg and lights are running 24hrs. Let me know if you’s would like more clear pics of just the problems. Thanks everyone they looked good a few days ago. Real green and Healthy.

Intake fan comes on 15 mins every hr. Exhaust is running in lox all the time with the lower vent open.

This is the romulan

This is the hash plant

This is one of the sour blueberry

Second blueberry
They just look down for about 3-4 days.