Question 

Can you tell what causes theses yellow spots to appear on my plants. It seems to have really stunted the development of these plants, they do not seem to be growing no matter what nutrients I try. Is it too much nutrients or just bad soil or what???

Answer 

From looking at your pictures I can tell you for sure that you should look under the leaves and you will notice that there is a fine web and little white bugs under the leaves. SPIDER MITES. You will need to treat these plants immediately. There are tons of mite products but make sure you follow the directions and treat the plants on and under every leaf on the plant as the pesticides will only kill the adult mites and then you have to treat the plants again after about 10 days to kill the nymphs (baby mites)  when they hatch.

 Click on pictures below for enlargements.