Help critical mass with spotts

Hi fellow green fingers i have a Critical Mass that's 24 days since seed , all was going well until i noticed today that on about 30% of my leaves i have very small yellow dots on them which i now have started to worry about ,i have checked for bugs but cant see any . The kicker is that i have a Pakistan Ryder next to it with yellow leaves and black spots check pics the Ryder has only 16 days left ruffly, Does anyone what the problem is ?Here some pics of the both of my grows,i am using a 250watt .The 1st 2 are the Critical Mass.The pics don't really show the problem to good,hope these help though ,cheers for having a look. L.C.C

These last 3 are Pakistan Ryder soon to crop

Are you feeding anything? It looks like they need N and K, but I can't tell how yellow they are from the pictures.

Potassium deficiency can cause small dark spots on your leaves, but I don't think this is the case in your situation. I imagine you have checked for insects, which could be the cause. Check you plant thoroughly using a magnifying glass. Good luck.

I see cupping(heat stress)...how close is it to the light

Are you talking about the Ryder? I did burn the Ryder and nearly killed it . But i have the light 3 feet from the chronic and 1 from the Ryder.
The chronic mass is in canna pro an i have been giving it canna a+b and formulex at the start, now going to start with rhizotonic and keep using the a+b canna.
Also checked for insects .
Forgot to mention there both auto's

Have you added any cal-mag little spots like that could be the start of a calcium deficiency. I don't know why but a lot of cannabis specific nutes seem to be skimpy on the cal-mag.