Feeding amounts and schedule depends on the kind of nutes and size of plants and the kind of soil or hydro system you use.... and yellow spots can also be from something sprayed on the plant, ph fluctuation (even in soil) or even what is called "gold-spot blight" which is a fungus.
BUT: It does sound as if your ph is off (get a meter or test kit) and only use Fox farms according to the feeding chart at the top of this board..
Even if you have downs syndrome, you are obviously able to read and write well enough to post this, and you can read and understand enough to read the announcements and stickies at the top of the forums... go to the beginners board !
Everything you need is in those announcements & stickies--- even a chart for using Fox Farms!
NEVER fertilize more than once a week... just go see the chart---K?
Good Luck Hun!