Slow Growth

Hi all I was hoping to get some help with my plant. I keep a grow tent at a constant 75 degrees at about 50% humidity. I wait til the soil is dry down about 2 inches before I water. My plant has been in flowering for 4 weeks. If you can spare some time could you please take a look at these photos and see what I might be doing wrong. I must add that I have not been using any nutrients. I do maintain the ph of the water right at 6.0. Thanks in advance.

why no nutes what soil you use

No nutes? The only time I had burn like that, I was using green light superbloom which is high in P. Looks like P burn to me?

what kind of plant? it looks sativa they tend to take longer time to bud. is that light burn on the leaves?

Unless you've got supersoil you need nutrients for growth, it's basic biology. The plant isn't that big but the bud development for 4 weeks of flowering is what you should be expecting really. What type and power lights are you using?

give them some food they do not have energy to grow

Up your PH to 6.5 for a start, your locking out vital elements there... Also they look very light green. Needs more N!

are you growing in soil?

edit: nvm saw you are in soil keep you ph between 6.5 and 7. do you have lime in your mix?

I am growing in a miracle grow soil mix. I know not the best to use but that is what was available. I understand that miracle grow has alot of nutrients in their mixes. My next grow I will be using a different soil mix with no nutrients added. I want to control the nutrients myself. So the brown on the tips can possibly be nutrient burn? I am not sure what strain it is because the seed is from a bag. I am not sure of the soil ph but the water ph is right around 6.0 or a little higher but not higher than 6.5. I have a digital ph meter coming soon so I can get more accurate ph readings. I am on a tight budget so I can only get one item at a time. My lighting is 3 40 watt cfls surrounding the plant Initially I thought the leaves were burned from the light actually touching them. I had to be gone for a couple of days and the plant grew right into the lights. Thanks for the responses as I have found this site to be the best out there for good information. So kudos to you all responding. I have to say I am really enjoying growing this fine plant legal or not and will continue to hone my skill at growing it. Again thanks all.