I'm a newbie and need some help to determine what is causing the leaves on my baby to turn colors on the edges. I will try to give as much info as possible below. Thanks in advance for your help!!
What is your experience level? (first timer, novice, experienced...)------>first timer
Your Equipment:
.1) Type and wattage of lights. (MH, HPS, CFL's, tube fluorescents, LED's)------>CFLS
.2) Distance from tops?----->2-3 inches
.3) Reflector type? (cool tube set-up, bat wing, enclosed reflector, bare bulb...)---->bare bulbs
.4) Is there a consistent fresh air supply?---->I have 2 small openings at the bottom of the tent, Inlets 95% closed
.5) Do you have an exhaust fan and a circulation fan?---->yes to both
.6) What are the bulb wattages, kelvin ratings, and schedule?---->75 watt-2700k-24 hrs on total of about 13,000 lumens
Your medium:
.7) Specific brand and type of soil, (coco, peat based soilless...) and anything you've added to it. (vermiculite, perlite, worm castings...)----> My own mix of 80% fox farm ocean forest, 10% fox farm happy frog 10% perlite
.8) Size of container.---->5 gallon
Your nutrients and water:
.9) Source of water. (tap or filtered) What's it's ph?---->Poland Spring water--PH around 6
10) Method of checking water ph. (ph pen, test strips, aquarium test kit...)---->ph pen
11) Method of adjusting water ph. (phosphoric acid, white vinegar, hydrated lime, PH Up...)---->have not done
12) Specific brand and N-P-K ratio for each bottle. List dosages (quantity per gallon) and current feeding schedule---Alaska 5.1.1.fish fertilizer--1 tablespoon p/g
13) How often are you watering between feedings, and how much per watering?---->watering every other day and feeding every other watering---approximately 1/2 qt per feeding
14) Any additives or tea's? (Superthrive, CalMag, molasses, Mother's Earth...)---->no
15) Are your ph levels stable, or do they fluctuate?--->I only checked ph before I started the grow...my plant is 5 weeks today
16) What is your ingoing water's ph? ...your runoff ph---->do not know
17) Do you foliar feed? If so, with what, how often, and at what time do you spray?---->no
Your growroom:
18) Indoors or outdoors?---->indoor
19) What size of closet, room or hut?---->30" width x 18" depth x 48"height small area
20) What are the temps and humidity levels while lights are on? ...With lights off?----> temps 68-82...RH 34-56
21) Have you seen signs of insects in the growroom?---->no
Your strain:
22) What strain are you growing? (Indica dominate or Sativa dom?)---->Indica dominante
23) Is this an photoperiod strain?---->Cream of the crop Cash Crop
24) How old is the plant?---->5 weeks
25) In what life-cycle is it? Vegetative, pre-flowering, flowering, rippening?---->I think it is pre flowering
26) From seeds or clones?---->from seeds
What is your experience level? (first timer, novice, experienced...)------>first timer
Your Equipment:
.1) Type and wattage of lights. (MH, HPS, CFL's, tube fluorescents, LED's)------>CFLS
.2) Distance from tops?----->2-3 inches
.3) Reflector type? (cool tube set-up, bat wing, enclosed reflector, bare bulb...)---->bare bulbs
.4) Is there a consistent fresh air supply?---->I have 2 small openings at the bottom of the tent, Inlets 95% closed
.5) Do you have an exhaust fan and a circulation fan?---->yes to both
.6) What are the bulb wattages, kelvin ratings, and schedule?---->75 watt-2700k-24 hrs on total of about 13,000 lumens
Your medium:
.7) Specific brand and type of soil, (coco, peat based soilless...) and anything you've added to it. (vermiculite, perlite, worm castings...)----> My own mix of 80% fox farm ocean forest, 10% fox farm happy frog 10% perlite
.8) Size of container.---->5 gallon
Your nutrients and water:
.9) Source of water. (tap or filtered) What's it's ph?---->Poland Spring water--PH around 6
10) Method of checking water ph. (ph pen, test strips, aquarium test kit...)---->ph pen
11) Method of adjusting water ph. (phosphoric acid, white vinegar, hydrated lime, PH Up...)---->have not done
12) Specific brand and N-P-K ratio for each bottle. List dosages (quantity per gallon) and current feeding schedule---Alaska 5.1.1.fish fertilizer--1 tablespoon p/g
13) How often are you watering between feedings, and how much per watering?---->watering every other day and feeding every other watering---approximately 1/2 qt per feeding
14) Any additives or tea's? (Superthrive, CalMag, molasses, Mother's Earth...)---->no
15) Are your ph levels stable, or do they fluctuate?--->I only checked ph before I started the grow...my plant is 5 weeks today
16) What is your ingoing water's ph? ...your runoff ph---->do not know
17) Do you foliar feed? If so, with what, how often, and at what time do you spray?---->no
Your growroom:
18) Indoors or outdoors?---->indoor
19) What size of closet, room or hut?---->30" width x 18" depth x 48"height small area
20) What are the temps and humidity levels while lights are on? ...With lights off?----> temps 68-82...RH 34-56
21) Have you seen signs of insects in the growroom?---->no
Your strain:
22) What strain are you growing? (Indica dominate or Sativa dom?)---->Indica dominante
23) Is this an photoperiod strain?---->Cream of the crop Cash Crop
24) How old is the plant?---->5 weeks
25) In what life-cycle is it? Vegetative, pre-flowering, flowering, rippening?---->I think it is pre flowering
26) From seeds or clones?---->from seeds
-- ...hey bruv, can you get me a whole plant shot too? From what I see, it's the upper growth affected most, right? Are the lowers okay? Symptoms look like Zn defc. to me, and if the fish fert's are all you've used, that's partly why... it's good stuff, but not a very complete nutrition source,... Zn is a micronutrient, and a critical one... it's immobile within the plant, so upper leaves get affected first and worst,.... you need to get a more balanced fertilizer, and right now, a micronutrient supplement, like Earth juice Microblast, or Botanicare has a sort of all-in-one product Ca Mag Plus,... another concern is the soil pH... 
soils are showing to be badly acidic more often than not,.. however, you might be okay there, at least for the Zn not being locked out by off-pH, as it's available under acidic conditions,... but a test at some point would be wise; you have a meter, so you can do a run-off test to get an estimate-- this method is prone to measurement errors! here's a link to a good method that helps reduce this: 
