don't touch your seeds.
use a rooting/cloning solution
Scuff
soak till the seeds sink, 12-24hrs
Moist paper towel (NOT WET) in a warm place top fridge or water heater zip lock bag in the dark 12-48hrs (Check it every 12hrs)
Use tweezers to sow your seed flush with your growing medium.
GOOD LUCK
The white spots on the leaf margins look like a Calcium Deficiency.
Your Petiole are really dark showing a Phosphorus deficiency.
Your in Hydro/
Lower your pH
Make sure to take in to account the solutions temperature when measuring pH.
You'll get a Diff. pH Reading from cold water compared to warm water of the same solution.
Good Luck on your Grow.
Be Careful growing that many plants together in one container. sometime they can choke each other out with there roots.
Depends how big your grow them. Just a heads up.
You should take a pic of the whole plant. we can see what she looks like from top to bottom.
Or you can let it ride for a while see if the problem gets worse. Your call man.
Good, you'll be able to get 2 grows out of it going 1/2 strength.
I know a dude from RIU that sorta got screwed on eBay bought some old Nutrients weren't that good. Buyer Beware I guess. Make sure there not old nutrients.
The only thing if you use the sledge hammer flush you should follow that...
If that's the only leaf with some damage I wouldn't worry about it.
Leafs get damaged now and then. you get a little water on them sometimes it might cause a spot or a water burn.
Go through a little check list
Temps- In range?
pH- In range?
watering- am I over watering? "Love kills sometimes"...
You can also trim the roots. like they do in Bonsai.
Keeping your plant in smaller containers - "The bigger the container, the bigger that plant"
There are certain chemical that will stunt your plants growth, break apical dominance (The plants ability to grow up)
You should learn all the ways to...
It doesn't look very green for being over fert. I see alot of purple stems. like a phosphorus defiencey
pH Range for CoCo Coir is 5.4 - 6.2
Good Link for CoCo Coir https://www.rollitup.org/do-yourself/48979-idiots-guide-coco-coir-5.html
IMO- I don't really agree with the whole check my run off...
M.I.T did a study on spider mites, it's a good read. there just about impossible to get rid of. They can hibernate, and all is takes is one to start, an infestation.
The best organic way to combat them IMO- predator mites.
Link to predator mites. there are several other sites out there...
seedling? what's it in? solo cup?
you might be able to transplant it, could be a option.
you could let it ride see what happens.
you could try and flush.
all depends how severe the problem is.
you should take a couple pics so we can see the severity of the problem.
seedling in soil only need...
DO NOT PANIC. A seedlings purple stem doesnt necessarily indicate an unhealthy plant. Please take the following possibilities into consideration:
1 - Purple Stems could be a result of that wonderful thing we call genetics, if this is the reason, you are to expect a purple stem throughout...
Look at the root tips, if there black you've got a problem.
my nutrient solution usually stains my roots.
One of the most important things in hydro it keeping things clean.
I clean every thing with a h202 solution weekly.
Short Day Plants.
The day it sprouts on a vegetative light cycle.
Like Greenlikemoney said, there's only 2 things the seedling can be doing when it sprouts Veg or Flower. Depending on the light cycle.