Is this a deficiency or lock out plz help

Hi guys both plants have been fine (I think) until about a week ago noticed brown spots on 1 plant at the top of plant that is getting the light I think it’s a calcium deficiency my problem is does it need more or less or isit just a lockout

15ltr pots
Pro XL sublime soil
Ts1000 light 2 plants on 100%

Looks more like magnesium deficiency or heat/light stress. What’s your temp and humidity levels?

And nitro excess ( dark shiny leaf )

Yes definitely a nitrogen toxicity, burnt tips also. I don’t see any clawing yet. you are cutting back on the nitrogen as they are in flower right? Without knowing anything about your environment I would say the humidity is on the high side. Are these autos?

Yes this 1 is fast budz star dog the other is fast buds wedding glue which is fine… temp is around 25-26c lights on depending on ambient temp 19-22 lights off light is ts1000 about 18ish inches away …. This one has always been darker in colour there were 3 in there but had to make the hard choice an lose one I have some cal mag now which I will dose in the next watering plant is still growing all be it abit slow and really praying iv noticed aswell I don’t know if that means anything I will get some fresh pics for you @ lights on

Last pic is the other 1 thanks guys

I would let it t ride unless it gets worse.

Toxic over feeding. Try straight tap water until new growth looks healthy.

Just looks like cal def to me. Autos often express it beginning of flowering due to fast stretching/flowering phase.

If it’s lockout more than one nutrient tends to be affected. It looks like only cal is low. I’d add some cal/Mag and see how it fairs. If it still gets worse then something else is at fault.

Brown speckled spots on upper fan leaves is classic Cal def.

good luck

Thanks for all the help guys am feeding with cal mag now so hopefully she snaps out of it an yes iv read that to about autos needing extra calcium in the stretch too …. Happy growing guys

Try 2.4 EC 6.1 pH.

plant looks to be overfed, really really green leaves