I would drop that Ec like yesterday!
1.5 or 1.8 Ec for a seedling, to be honest I am surpriced it’s still alive and looking that well.
I use the same nutes myself, feeding in hydroton.
Right now I am 25 days into 12/12 - see pic below.
My Ec is currently 1.4, have dropped down from 1.6
An easy way to understand your Ec (electrical conductivity) ballance, is looking at your plant like a “magnet”
All it’s atoms have a small charge, posetive or negative and all combined makes up a final “number” let’s call it Plant Ec.
Now your reservior is also a “magnet” and the more nutrients you pour into your res. The higher the electrical conductivity become in your res, the bigger the magnetic pull get’s. Now the nutrients will travel to the biggest magnet, if your res have a higher electrical conductivity, then the plant it will “suck” the nutrients out of the plant, rather then the plant is uptaining the nutrients.
Now it’s called osmosis and reverse osmosis in plants, the “magnet” stuff is just to make it easy to understand.
I would try and lower the Ec to 0.9, and see if that won’t speed up things.
Temps and everything else looks good!
Try and find my thread The Hack Shack and other tall tales, in the advanced forum, there I am doing almost daily updates, with Ec and pH values listed.
Happy growing!
