Help Yellow leave edges getting worse :(

Hello,

I posted the pics below
My leaves became much worse. Identify please Bugs, too much water?

1. Setup 2x125 large CFL lamps
2. Autoflower Nothern Lights
3. 1 Fan
4. I did not start feeding nuts, can I start?




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What type of medium; soil or hydro? I bought soil from the hydro shop didn't have a name on it.

What brand and type of soil? Unknown

Indoors or outdoors? Indoors

What strain? Nothernlights Auto Flowering

How old are the plants? Around 5 Weeks

What type of lights and how many watts? 2x 125 Large CFL lights

How far from the lights? 3-4 inches.

What is your watering frequency and source of water? Watering them according to weight of pot. Every 3 days or so Give them around 0.7 L

What, how much and when was it fed? NPK? Nothing yet.
What is the medium/runoff pH and PPM if in hydro? Dont know

What are the temps and humidity in the room? 79 degress and 60 rH humidity

What size pots? 10L
Any bugs? Look real close.Unsure

ph issues imo. locking out magnesium

Find a way to lower the temperature and/or increase the circulation in the grow room or grow area if heat is the problem. Having a small fan blowing over the tops of your plants will help prevent hot spots from forming directly under your grow lights. If your marijuana plants are just getting too much light, try removing some of the lights or moving your lights further away from the tops of the plants.
When learning how to weed, it's best to try to keep things at a comfortable room temperature at all times for optimal growth. If it's too hot for you, it's probably too hot for your plants.

http://www.growweedeasy.com/marijuana-symptoms-pictures

Check your Ph