my leafs are two tone in color?

Can anyone tell me why my leafs are a nice green but lighter green in the middle? temps have been in the late 50's at night,could that be part of my problem?

Possibly. Low temps can cause yellowing, as you described, but we'd need pics to be able to be certain that it isn't a deficiency starting.

Very low temps cause yellowing, like in the 40's. Subtle sub 60 temps cause purple colors over the course of a week or so. I would say that Nitrogen would be a cause of lighter shades of green. Pics would help. Here is a link to self diagnose problems with deficiencies:

https://www.rollitup.org/marijuana-plant-problems/118601-guide-plant-deficiencies.html

i got pics comin but thanks for the help fellas!

you need more nitrogen. what kind of soil is that

im not sure,i picked em up in soil already. i had a person cut me some clones,and there were doin better a week ago? idk what i did wrong? gave em a lil nutes but not much.....