Seedling with rust / black dark spots. Help plz

Hey, sorry was doing that on my phone couldn't figure out how to type and add pictures lol.

OK so here we go. Seedlings are in a tent with a LED aprox 18" away temp 25 c humid 60%, Ph 5.8. Well ventilated. I just switched the water cause I was thinking maybe it was to much nutes OR to much CAL MAG which I'm thinking it was.

So I redid the water and barley added any nutes as they are just seedlings and didn't add any CAL mag cause my water is medium hard, at like 187
^straight from my cities daily water quality reports.

Also, my last grow i ran into similar problems same type of issue except way later in the grow. The picture is of the other plant in the tent getting exact same nutrients etc and it's doing lovely so im not sure :/

Help appreciated as always

Yello.
Yeah people will need more info about ur grow PH, nutrients, simple said basic info of ur grow.
GooD LucK.

On the other grow I thought it was a Cal deficiency, but maybe it was to much? Exact same spots as this seedling and leaves were crispy and died off eventually. I posted the info above

4klaunch said:

On the other grow I thought it was a Cal deficiency, but maybe it was to much? Exact same spots as this seedling and leaves were crispy and died off eventually. I posted the info above

Click to expand...

cant really help you on this one cause i dont grow hydro or dont even know how hydro works apart that you need a container, water and a pump XD that all i know about hydro . Hopefully you solve this and also somebody will probably help you since i saw a few good hydro growers on here.

Getting worse ugh.