First timer, growing 'strawberry cough', and I have lots of questions...

Hello I am a begginer marijuana grower, this is my first crop, I am growing Strawberry cough. I am 28 days into budding and things have been going pretty good. I have a lot of questions and would like some advise to know if I am doing it right, so I can stop second guessing myself so much. My plants are coming along nice, but they appear to have turned yellowish all over. I looked closely and a few leaves have turned brown a tiny bit right on the end. I have pics. I want to make sure that they are ok, I dont want them to die. I had a problem with my tap water, it was turning my plants yellow, so I bought a reverse osmosis (ro) filter, they seemed to look a bit better after filtering the water, then one of the parts broke on the ro filter, so I was buying gallons of crystal geyser bottled water, the plants definetly got greener. A couple times they looked yellowish and my friend said they didnt have enough nitrogen? . I used Fox Farm- Ocean Forest and Roots Organics- Formula 707 soils mixed. I going to list the nutrients and products I currently have so someone can tell me which I should be using, I have:
Hygrozyme
Liquid Karma
Botanicare Sweet
Superthrive
Age old kelp
Gravity
Roots organics- Bloom
Soul synthetics- Amino acid
Roots organics- Trinity
All of those I got at the hydro shop, (I also have gallon of Alaskan fish fertilizer, that currently do not use) I also have some other stuff but I already know that I shoulding be using it at this stage. I havent been using all of these nutrients. If someone could help tell me what I should be using that would be great. The soils I used have nutrients in them so it makes it a little more tricky. I was also wondering if I should use all the same brands next time, maybe that would be better for the plants? Ive been thinking that my waters PH is incorrect? Im not sure how to check it. Also I started boiling the ro filtered tap water this evening, aswell as letting it sit over night. But it looks like to Crystal geyser for a few days, because the RO's attachment broke on me, I ordered the new piece online, but iy wont be here for a few days, and I was only able to filter, and boil 4 gallons, thats only enough water for tomorrow. Thank you for your time, I look forward to hearing from you. I will put pics up later.

for PH. take a sample of water(4-8 oz) to a pool supplyhouse.they can test the water and sell you a basic test strips- just dip in water & compare the color to a chart. its not perfect but for soil....
next you can get a little dolimite lime at a garden store to mix in to your soil,it will balance your PH.
as for the ferts, I dont have any experiance w/ what you have so I cant say other than superthrive is good stuff & the fishferts are also great for veg as its hard to nutburn w/ organics. suspect nutburn had more to do w/ your plants turning yellow than the water- most municaple water is close enough for soil