HELP - Whats wrong with my baby?

Hi,

Please help.... with my hydro

med/large grow tent
1 x 2000w grow light @ 18hrson/6hrsoff
1 x carbon filter
1 x oscillating room fan
Temp: lights on 24.6c/76.3f lights off: 23.7/74.7

growing in a grow cube, roots have started to come out the bottom. Grow cube sitting a soucer/plate

Plant was growing fine till about 1 week ago when she started to lose her greenyness and a small brown spot appeared. now she looks shes getting worse.

watering/feeding twice a day with nutrients.

ive been doing heaps of research but it looks like a combination of things but i dont know what im doing wrong i dont think its nute burn only cos i use a relatively weak mix (half recommened dosage).

Please help... im baffled and should i cut the shitty leaves off? the camera makes the leaves look greener, the leaves getting a yellowish tinge




many thanks

over-watered, imo

Cheers mate, but the thing is I've been giving it 2 light waters a day since she spouted and last week I went away for the weekend and didn't water it from Friday night till Sunday arvo, when I got back to water it and check on it that's when it looked sick and stopped growing.

So just water it once a day for now?

Thanks again

yes. once a day, and see if it improves.

The pic in the middle is when it started to get sick, the other 2 were taken a week later

Cool thanks

middle pic sorta looks hungry. let's find someone with experience with that medium. i'm soil, all the way.