I am on my first grow. It is hydroponic and i've been doing my homework (for years it seems).

Most of my babies look great. I am, however experiencing a few problems with a couple.

The two plants in the rear of the middle row are the ones I am speaking of. THe 2nd from the rear plant has a yellowing on the sides of a few leaves and another leaf has the edges curling upward (may not be visible).
The rear plant is very strange. Deformed, twisted leaves.

Troubleshooting for the middle plant in second row leads me to believe magnesium deficiency. I would not know about the rear plant that is all twisted and deformed (some leaves curl up, others down, others around).

My PPM is high for this stage (600 or so but i was told this strain can take it and the others are great). My PH is right on 5.6/5.7 and temps are usually great (75 to 80).

ANy adivce? Should i look into rebalancing my nutrient mixture (advanced nutrients) or should I supplement with something that may be lacking?

Thanks for the help.

I think over all it's looking pretty good. Endless sky.

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In most cases this is caused from to much nutrient, the plants my be able to take the higher ppm but seedlings may not. Try using less nutrients until they are about 12" tall & see if that helps. Also be careful that the heat from your lights is not causing this problem, if you hold your hand just over the top of your plants & it feels hot to your hand then it is hot for your plants. BTW, your plants look beautiful!

nute burn had the same problem

Thanks, I'm quick to over diagnose being my first time. I figured that if the majority are doing well that...well, I'll lower the ppm and see. Could over fertilizing really cause that kind of twisty deformation?

Today I looked into why my airstones werent pumping out many bubbles and realized the hose was restricted. I hope the increased airflow will have some positive effects even if not with my problems.

I think they look good too..and they grow fast but when you look at them so often it's not fast enough

Yeah, malformation is a classic symptom of too much nutrient.

Keep a close eye on your pH levels, dial back the nutes slightly, and everything should pull through. Once your plants are a bit bigger you should have no problem ramping the nutes back up.

Thanks for the advice. I dialed back the nutes a wee bit. My mother (??) plant is in the worst shape with burnt tips but she'll come around. When I look at them so often it seems they take forever but now that i look back at the pics from my first post and these...wow!

I know this has been discussed a bazillion times but a predicament I will face is that I started these all from seeds. So..i'll not be able to tell sex until flowering. Can i clone a plant as it is leaving vegetation (only a few weeks old and about 10 to 12 in. tall which is not yet) and going into flowering so that I might have a sure fire set of females around or is that too early to clone? I must wait until I can flower a clone from my mother until I know IF it's a mother. I just dont want to end up with this strain dying out. I also dont want to worry much about early sexing.

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That's not a big problem, the main concern with cloning is that the plant is big enough to provide you with proper-sized cuttings to clone from and will have enough left after the cut that its own growing won't be stunted. You shouldn't have a problem there.

Beyond that just make 100% sure you keep each plant and it's clones clearly labeled. That way when a plant lets you know if it's a boy or a girl you can easily tell which of your clones came from that plant. If you get a boy and you don't want any boys, you can just immediately discard his sons.

In fact, a lot of people that like to top their plants will clone those tops.

It's never really too early to clone as long as the plant is big enough to survive the process without too much distress.