Grow Mediums New grower Seedling leaves twisted curling discolored, don't know what's wrong help

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I have a seedling and has started twisting and dis colored at the center. Don't know what's wrong. I have a hydroponic setup indoor tent.

Temp average 73-77 lights on 68-70 lights off
Humidity ranges 50-70 depending on warmth in room.
In take air at the bottom leaving an opening at the top for any warm air to go out.
Lights on 20 off 4
Air stones water pump feeding bytes into rock wool in clay pebbles.
Ph maintains 5.8 average.
Ppm is 235
I use general hydroponics nutrients micro, floragro, and florabloom.
I have led about 2 feet away.
Water temp averages 68 degrees.
Fan blowing low to circulate air.

I put seedling into my hydro setup on the nov. 19th had first set of true leaves. I started nutes at 1/16 of a tsp of each of the nutes above. Instructions say 1/4 tsp. But I wanted to start slow. Checked on Ppm and was low so after couple days I added more nutes to maintain approx 200-250 ppm.
A few days ago the leaves started twisting and are discolored yellowish. I checked the roots their growing and fine and theirs no algae in water I checked.

I'm still new to this so any help will be greatly appreciated. Hope the pics help.

sorry about the pics being side ways.
 

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