Seedling 2nd Pair of Leaves turning Black Please! Help!

Hey guys I'm new to the hydro thing and I would really appreciate if u guys could help a newbie out, so my seedling r about 2 weeks old been feeding my plants iguana juice since signs of first leaves (like I said I'm a newbie don't know names or slang for leaves) now I notice that the 2nd leaves that's r coming-out seem to be turning black does anyone have an idea what this could be also ph is at about 6.0 to 5.8 Gonna try and post a pic camera not to good so I'll see what I can do

Black as in BLACK, like a black sharpie, or black as in brown, like dying leaves?

seems to be a sharpie black but maybe a dark shade of brown

not a very good pic kinda to small to see

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Those leaves die, Always watch the new growth for problems. What are you going to use in your system?

The seedling leaves seem it be fine along with the bigger first pair now that the second leaves or new growth r comin out they (to be dying?) r back on the tips can someone plz help me for it to last thanks again for your help

Went out and got a Tds meter, meter reads 950 ppm seen somewhere that is to high for seedlings (also read seen somewhere if your using organic you do have to worrie bout the ppm anyone have any input on this) so I cleaned out the res put new water (tap water ppm reads 150) added couple drops of nutr water read 240 ppm am I on the right track

OK I have to see better pics then. Shut the light off it works better.

iphone camera not the best+

I am thinking too much nute organic or not. Plants that size do not need a whole bunch of nutes. Flush the system just do water and make a light foliar spray and use that for now. maybe 1/8 teaspoon per quart.

thanks ill try it out le tya know how it goes