What's wrong with my seedling???

hey guys. This bad boy sprouted exactly 8 days ago today. The first 4 nights I had her under 2 cfl bulbs in my grow cabinet due to it still being a little to cold outside. It sprouted and grew for the first 3 days no problem. The past 5 days I have had it outside during the daytime to get sunlight, and bringing it inside at night time for warmth.

On the 4th day I noticed some yellowing, which begun in the inside of the leaves, then spread to the whole 2 leaves it seems. Its weird because the 2 main leaves are quite big for a seedling, the new 2 leaves that are meant to come out seem to be growing very slowly, and they too are lime green/ yellow. I'm growing in coco.. gave it a real light feed the other day but no fix. The roots seem to be growing really well.

I'm not sure if it's cold temperature shock, as it still isn't spring just yet and it is a little on the cool side outdoors ATM.. anyway anyone else had a problem like this? Strain is liberty haze - Barneys farm

First off, don't use a clear solo cup!

Re pot that into a colored one please.

Personally, I would have started the bean in real soil. Starting in coco is the easy way to fry a seedling...

Coco for a newbie, is not the most forgiving way to grow.
I suggest you put that in soil, and run in soil for a cpl of grows. Learn the plant. Then tackle coco..it has special needs (coco).

Maybe you should have read a book on growing first?

Going into anything blind is ........

I grew in coco last year with 4 plants all were sweet. Only difference was I started a month from now, spring in Australia... weird

I think it's a weather or light thing..

I worked it out. Pretty sure I put the seedlings in straight potting mix i or from Bunnings (cheap stuff) and seems like it was a little too strong for a seedling. Transferred it this morning and even by tonight 6 hours later the second set of leaves have shot up

Transferred it into straight coco.