Indoor Northern lights/leaf diagnosis...any thoughts?

[Bonwigs]

Hi all growing going some what ok a bit under size but health (to a certain extent) i have noticed that there is a few brown spots,looks like a dead spot on the leaves, affected areas are on the bottom in the middle and on top of the plant only a few leaves at each level,done some research from what i can see it all points to calcium deficiency,which would make sense as it also would contribute to the slowed growth,only one plant is affected which makes me believe it might be a ph issue,the nutrients i use from memory have calcium etc?. You will also notice the serrated edges of the leaves are curling or pointing up,that makes me believe the light might be to close.?

Another issue i have had from memory started around week 3 (from seed).
As you will see the very tips of the leaves are slightly yellow not bad enough to worry so i let it be and kept an eye on them,just noticed a few days ago some of the tips are dying like nutrient burn, im still mixing below the reccommended dose at 1ml veg 3ml bloom, you can look at my grow journal but i think i was only giving 1m veg 1ml bloom from the start i then went 1ml 2ml and now 1ml 3ml, ph6.2-6.8....any thoughts what the issues could be the causes...cheers.

 

[LazyNhazy]

I would do a run off test for soil pH

 

[Bonwigs]

I would do a run off test for soil pH

Yeh i did that at the start of the grow,but found the run off to be the same as it was when it was made up at 6.5, i then checked the soil ph an hour later after watering itmwas way down at 5-5.5. I then tested the tap ph it was like 7.5-7.7....so if i water at 7.5-7.7 by the time it drops it should be at the favorable level,when i checked it was 6.6.

 

[LazyNhazy]

Best way I've come up with at home is soak the medium walk away for a couple hours and water again slowly, check runoff after a few seconds of it running out. But make sure you add second batch of water slow. You want time for it to absorb the water that's in the dirt already.