Cal mag deficiency

Hi just wondering if any one could help my plant has been getting brown and orange ish patches nd leaves turning a bit yellow and it is mostly on the lower leaves.

Was about to start my own thread but this is somewhat similar to what i'm having. I'm thinking either cal/mag deficiency or fungus, but since i grow in a small closet with an exhaust fan constantly running, i'm not sure about the latter. Started showing about a week after replanting (solo cup to 3/4gal pots), first on one plant (first 3 photos, it's the one on the top right), now others are showing symptoms.

Watered the plants today, after a few days break, just took a moisture reading of 45. Label on the soil pack says PH 6.5, also said to contain ground lime with MG content. Still need to wait a couple days for calibration fluids to get a confirmed reading.

Its weird man I've been giving her cal mag and there seems to be no different, but I did notice it all started after re potting.

I bought some Epsom salts yesterday from Holland nd Barrett £5 for 1kgive got to pick it up tomorrow as had to get it delivered to shop, so hopefully this works fingers crossed.
The pound shop have a big bad of Epsom salts but its fragranced, fucking gutted but my lass still bought it for a nice bath.

Got my PH tester back in line today. Tap shows ~7.6, around 7 when mixed with soil, looks like the soil itself was pretty much neutral from the start (label said 6.5), all the watering has probably only increased my PH.

(pic related) is Manganese deficiency which is related to PH levels above 7, there's an article about that. I suspect i've locked out some of the minerals from the start, and it's only beginning to show. Just a theory though, but i'm going to test.

Anyway i'll try to do my next watering with PH around 6, probably flush the sickest plant tomorrow as a test subject, also check the roots.

I bought some strips even though I have a digital ph meter as strips don't lie, its something to have just to be sure=)

How are your plants holding up? Flushing mine with a weak nute solution PH'd to 5.8 seemed to help. Made photos of the same plant a day before and 5 days after the flush. It's greener, the rust is not spreading, there's also new growth. Made a new mix PH'd to 6.3 and transplanting to double size containers tomorrow.

Got sold some crap for soil which locked out my plants, that's all i can figure.

Mine seems to be getting worse Ive tried Epsom salts nd cal mag so I think I do need to flush her what strength bites did u use mate? Nd I think its off the cheap soil aswell mate as my others are in decent soil nd there fine, its props head battering lol

Don't overlook the value of a good bath.