Ok, let's see... The Scott's Premium has an NPK of .07 - .01 - .03, you have no additives, and you are using unbalanced/unchecked water from the tap. You my friend have a nitrogen deficiency for sure! You may also have a magnesium deficiency. Plus the pH may be too freakin high.
Now for the fix. Go to your nearest gardening store and buy a pH tester. Whether it's digital or just the strips, it won't matter. While you're there, buy yourself some different additives. Things like different guanos or manure, worm castings etc. will work. You could also just buy some non-organic nitrogen additives. The salesman will know what you need. Then when you get home, add the nitrogen building additives, use the pH tester to test the pH of your water and make sure it's somewhere around 6.5 then water like normal. If you bought non-organic ferts, then you will have to add them to the water prior to watering. Keep in mind that they will lower the pH so make sure to test the pH before and after. Your plant will bounce back in a few days.
Maybe someone else might want to chime in but I think that's enough info to get you back on track. Also, for further reference... don't use BS soils when your gonna grow the ganja. Stay away from Miracle Grow and Scott's. That's just an opinion though. Go for something as little more geared towards the ganj. Like Fox Farm Ocean Floor mix