This anything to worry about??

Plants are around 2 months old and look healthy, but some are getting brown spots on the leaves not to many though doesn't look bad just a little and ive been watching it for awhile and its not really getting worse here are some picture's any thoughts?? Ohh and ive been useing Miracle Grow all Purpose Plant food its 24-8-16 I know I know ewww MG sucks. But its what I have to work with until I get better neuts, and ive only been feeding them 1/4 the recommended dosage. I figured a little of something is better then nothing and that just that little amount of MG cant kill em ya know?? I water them about every other day it seems and use MG once a week most the time. Also I do mist them with the hose every now and then could those just be burn marks from the sun? Or are they just telling me they want more food??

It could be from the misting of the plants which just washes the leaves and washes out the nutes. I would not worry they look healthy. I would put some dirt/soil in those pots. I also would think about flushing the soil to get rid of some of the salts from the nutes before they start locking out nutes.

overwatered, and overfed. I've used the same MG mix you have, and while I won't berate the brand like most on here seem to do, I'll tell you the mix is potent stuff. I fed mine a total of twice at 1/2 recommended dose in one month and got the same brown marks... the initial stages of decay from overfeeding (it gets much worse, even if you flush 'em now). Some drooping of leaves is natural and expected, but pic #3 looks exactly like some of mine did when they were overwatered. I don't know if each strain is different in that sense, but in my brief experience, the plant is like a geranium and likes to be dry more often then not.

Hmm k well I normally let the soil dry up quite a bit before watering and even then I dont water them to much. I guess my best bet then is to drop MG all together and just use water from here on out until I can get some good neut on my hands. I'll probably flush them once or twice and see how its goes. They look pretty healthy and seem to be doing great do to the fact that I see them grow everyday so ill just wing it and we will see what happens.

That's the key... as long as you can measure growth every day or couple of days you've got be doing most things right. I think the hardest part for newer growers is to just sit back and let the plant do it's thing. For the first few weeks I was inspecting every part of the plant like it was a murder scene and there's really no need for it. The plant is going to do things on its own because of the strain, genetics, ect... that you have no control over. Overall those definetly look healthy!