white dots black dots brown dots... im getting worried.

hey guys n girls i was wondering if anybody could help me.

I am noticing an increasing problem of dots on my leaves.. I thought it was an old problem from when i had a slight case of damping off which seems to have sorted itself out with the use of Dutch Master Gold Range Zone (i would highly recommend as it sorted what seemed to pythium wilt within days) and also maybe due to the fact the seedlings have toughened up a fair bit.

So i just presumed the dots came from spraying the plants under hps during th earlier days. However, the dots are not showing newer leaves on some girls and also getting worse on affected leaves.. I presume I have some kind of bug or bacteria etc..

The girls seem to be growing fine.. They are autoflowering plants and have started showing pistils.. I changed to bloom nutes yesterday and want to get this problem, sorted.

I trust many of you guys will know exactly what the problem is.. this is my first grow have done research on the matter and have a couple of potential solutions but dont want to solve problem that doesnt apply to my plants.. so please check out the pics.


Pics are of the most affected leaves..

As you can see the problem is starting on lower leaves and is spreading upwards. Affected plants are showing signs of yellowing leaves.

Upon further inspection today i reaslised my healthiest greenest plant is showing white dots. Is this the same problem?

I am growing in nft with rockwool medium.. water pumps turn off during dark hours.

Any help is gold. I will try give reps for replys if i figure out how to lol.

This is my worst affected. The leaves on this girl seem to be curling up as if the plant is being attacked.. Leaf is drying up and dying.

this might be what one guy i talked to calls "necrosis", i have it on one of my plants..the leaves wilt from the tips and curl up and get crunchy while still on the plant, i lollipop my plants to prevent this as much as possible, dont know any real solutions except try a cal-mag supplement and try to widdle down the possibilities..it also may be a nitrogen loss issue..idk