I’m a new grower and noticed an issue with my leaves. They have a yellowish color at the ends and light green circles within the leaves. Plant info below.
-indoor grow
-18 days old from sprout
-Auto Flower
-Medium is Coco Loco by Fox Farm (not coco coir)
-light is 450 watt at 30% power and @ 32” from tallest plant.
-Water is PH 6.2
Have not fed any nutrients seeing that my medium has enough for 3-4 weeks. Only watered whit RO water with SI . Started mixing CalMag into my water 1 day ago.
Any help would be greatly appreciated.
Welcome to the forum.
Blemishes will come and go as the plant matures. I don’t see anything to worry about. Your plants look healthy.
keep up the good work Welcome to the community 
Thank you for the reply.
Welcome @Thads2day this is a great community, you’re gonna love it here. Glad to have you with us.
One of the best places on Earth. Have a ? , someone got an answer. You are among friends. Grab a chair… .sit a spell.
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I really appreciate the warm welcome. I was hesitant to even post. Thanks again.
Welcome to the forum 
Never think twice about posting any questions you have on these forums. This is the best community of people on the Internet period. Welcome to the grow family!
A little light burn maybe dosent seem to be much they aren’t stretching
Welcome to the community keep updating as your grow progresses if you can. Everyone loves to see a fellow grower become successful. This group will sure help you get there.
A little update on my grow. I’m still having issues of the yellowish on leaves and it’s getting a little worse. Now it’s on the tips of leaves and the leaves are drooping. The tips are also starting to turn down. Not a lot but it does seem to get worse day by day. My medium is amended with nutrients. So I’m assuming every time I water I’m also feeding the plant? I’m thinking that the leaves are reacting to me watering too much and causing nitrogen burn? I’ve only watered every two days and the most I’ve watered at one time is a half gallon. I’ve not watered to run off because the plants were young at the time. Now I’m not sure what to do with watering. The last watering was Monday the 5th (1/2 gallon) I may be over thinking the whole process. Just worried that I’m stunting the plants? The leaves are not perky lake in the past and seam to be drooping a lot?
When I water it’s RO with Si and CalMag PH @6.1-6.2
Hope me cheap PH meter is not off?
Should I keep at what I’m doing? Any advice would help. Also included some up close picks of the leaves.
Plants look good. What are you using to monitor ph? You said it was cheap. Is it one of those prong things with a meter? Next time you water your plants pic up the pot or bag and feel how heavy it is after, in 2 or 3 days pick it up again should be much lighter. Stick your finger in the dirt on the edge of the pot just past your knuckle if the soil is dry time to water again.
I have a 3 in 1 PH meter from Amazon. Going to order a Should a Apera PH meter soon. Seams it will be more reliable. Should I be worried about the tips of leaves turning down and the yellowish marks? I’m not sure what’s causing it? . Also when I water next should I be watering until runoff? Plants are 22 days old from sprout. Thank you for the reply.
I wouldn’t water till run off yet. See what others say but I think it’s too early.