What's Wrong With My Plant?

This plant is about 4 weeks old. A few days ago I made some compost tea to see if the brownish area on the bottom leaves of my plant would disappear, but it didn't. Can somebody please diagnose this!

Thanks!!

Pics:

its nute burn and your over watering just slow down on everything no need to rush half dose next time make the time between feedings longer

Thanks for the input! That was the first time I actually gave it nutes. It might be over-watering, gave about half a cup of water a day.

Could it be a nutrient deficiency? I don't know what I'm doing worng. The plant took in light from the sun ever since its birth, then I decided to put it inside a closet with Fluorescent tube lights. Could the light be an issue?

do you understand how much light you took away from it?? there is your problem right there if nothing else its like looking into the sun then going into a dark room with 100 watt light and trying to read a book..

it takes time but it will work it out..

what hind of soil are you using? could have a lot of nutes already. as much light as possible at this point is fine, so no it was not your light.

but yeah slow down on the watering this can have the same results as over feeding in soils with a lot of nutes, like Fox farms or roots, without mixing them with amendments hav a lot of nutes and the soil as is can get a plant through about a month or 2 of growth without adding nutrients.

no you plants a lush and full of water no visible deficiencys.

i doubt the fact you removed it from the sun had an impact at this point, im assuming it was in a window or something? either way the plant is not in the shape to make full use of the suns light and will grow just as fast under the flouro, especially if you have it on 24/7 it may take the plant a few days to adjust and start growing again but it would not damage the plant in any way.

could be overly humid in you cab that can cause brown edges on the leaves you could make your exhaust fan for the area stronger.

looks like excess nitrogen and overwatering to me...