Course of action/overwatered maybe some mold ?

First of all big thank you to all you experienced growers that take time to reply and share knowledge it's a HUGE FKN HELP. Between this and the Google there is a ton of info available.

Last year I was given some 3-4 week old plants from a friend , I hadn't grown weed before only mushrooms but was able to do the adequate research to not only keep them alive but grew some some pretty big plants ( I'll attach pics) (I'm aware or alot of my mistakes I know there bushes lol)

Because of that good experience I invested in a indoor set up,
I bought some of our local hydroponics store house brand seeds while waiting for a quality seed order from online to come in pics are them .

Although I have now done monthes now of growing research and shit , I didn't realize that seedlings required so little water ( my opinion of so little ) and have overwatered some of them (see all pics) (heard u guys like pics )

it looks like now as a result some have an infection, and I just need to know best course of action I'm not mad to throw them away or bring outside and monitor them ,
also one plants a little bit light but I'm thinking just my dumb overwatering

What medium are you growing in. If it's overwatered just cut back on the watering, place some fans blowing across the soil and maybe till the top inch of soil to increase drying.

They look ok, what medium? They may be ready for some nutes.

70's natureboy said:

They look ok, what medium? They may be ready for some nutes.

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That's what it looks like to me as well. I don't see any real indication that it's an over water situation with the pics provided.

OP, you need to pH both your water, and water/nutrient mix every time you give them anything. 6.5 for soil, 6.0 for peat-based products. I've heard 5.8 for coco, but the coco folks will have to confirm that as I've never grown in it.