Spots on plants (Pics Included)

I have read the sticky posts on plant problems but can't really tell about my plants. I have 2 clones (unsure of age, we acquired by a friend) and one plant has these spots like on 3 different leaves, not the whole plant. The second plant only has the spots on one leave.



2nd picture:



3rd picture:


2nd plant:

looking like overwatering or an mg problem

Interveinal necrosis.

Mg, pH, or oxygen issue

Make sure calcium levels aren't too high, check your pH, and make sure you have good enough drainage/aeration of your soil, and that it's not packed too tightly.

Thank you fellow members......I think it occured from going from one water source to my water source