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What temp are you running in your tent? What wattage HPS are you running and how close to your plants are the lights?

Stop feeding them and watering them. No lime or calmag or anything. From now on you need to lower that ph to atleast 7 before watering. Did you physically see the gnats?

You feed them nutes every other day? Looks like a lil nute burn to me.

I've seen blackdogs. They make a very good led. You should try and get your plants to temps under 80. That's when they are most happiest. Led lights won't burn your plants as bad as MH/HPS but you should still keep them cooler. That will definitely hurt you in flower. Plant is probably...

the water you are using is reading 8.0? Have you tested the runoff after you water it? How often do you water it? It's probably a magnesium deficiency. Pretty common for plants that size that have fucked up Ph. My advice is to flush your plant with water and find out what the PH is of the...

How old is your plant?

What are you feeding them? 12'' seems kinda close for a 400w MH. What soil?

Agreed. Don't water plants unless they seem absolutely bone dry. Don't worry about underwatering plants. If your plant is too thirsty she will tell you by saggy leaves and drooping limbs. Easy to bounce back from. If you over water you are essentially drowning your roots, stunting your...

Nothing is gonna fix itself over night. Just be patient and keep a eye out for new leave spots. I would look into Big Bloom. Has a lot of micros you might not be receiving from your Grow Big. Also add a tsp of cal/mag to your feeding regimen from now on.

Stop foliar feeding cal/mag. Just get into the habit of always throwing a tsp in your feed everytime. If I had to guess it has to do something with your ph and your fert. You said you are using grow big..... What about big bloom? How much GB are you giving them? Are you testing the PH of...

Let it dry almost completely. You probably have enough water in there for an entire week depending on the lights you are using.

Looks like Mag to me.... If you aren't giving them Cal/Mag you should atleast foliar spray with epsom salts. That helped me when I had that same problem.

I think its just too much moisture. 70 pct humity would probably be fine in itself. Don't water your seedling at all. You need to let those roots grow before giving it all that water.

I dont think you need to keep that under a dome. My seedlings were smaller than that when I was running them under my t5. How often have you watered it?

This is a pic after 12 hours of light.

Yes. I test PH and ppm at all times and test run off as well. I try to keep my PH fluctuating between 6 and 6.5. The new yellow growth has gone back to the healthy green I'm used to. I'm pretty sure now that it was just a sign of light deprivation.

Thanks! I just checked out your LED pics! They look great! I'd like to switch over to LED's for my next grow.... Picking out lights though is pretty hard and confusing..... how much did you pay for your setup and which ones did you go with if you don't mind me asking? I feel like you could...

I flipped on the lights after a 24 hour break and I'm stunned at the amount they've already stretched. I think the entire canopy raised about 4-5 inches. One thing I noticed is all of the new growth is bright yellow. Is that normal? I know that if you cover grass it turns yellow after a bit...

Great info guys!! That's definitely something I would probably not been able to find on here since I wouldn't have been looking for it. Lights have been off since 6pm yesterday and they will be flipped on for the first stretch of 12/12 tonight. I'll do as the doctors have ordered on the light...

I see that now as well! The reason I did 5 is because I was given 10 WW's and wanted to do half and half..... but now that I've done these I'm thinking more along the lines of trying 2 plants in 7 gallon containers next run and give SCROG a go.