Help Diagnose My Two Babies!

Hello All -

This is my 2nd grow. It is a very simple grow with just about 5-6 cfl 100W equivalents. Two Sour Diesel Plants were started out of red solo cups. They seem to be doing OK but have signs of either over watering, high nutes, or pH problems. I can't seem to figure it out so before I do anything stupid I will let you guys have a whack at it an see if you can find the culprit.

2 sour D seeds
Fox Farm Happy Frog Soil
Fox Farm Big Bloom Nutes (Only fed them once with this and it was about 20% strength.)

why are you feeding SEEDLINGS nutes??? Ya think that could have something to do with it?!

That, and based on your plant structure I would turn your cups upside down into your hand and check to see if they are pot bound with roots.

Yeah I honestly figured that would have done it. It was a mistake so I take full responsibility. And I know they cannot be root bound yet as it has been only about 1 1/2 weeks to 2 weeks. Also, the growth hasn't been stunted at all. It just seems as if they are curling down and inward...Ive seen full grows in a red solo cup before without transplanting and yielding about half zip each plant. That was my goal as I am limited in space and money. Also, the seeds were from a friend so I thought what the hay.

I at first thought it was due to over watering as the soil stayed fairly moist for a solid amount of days... maybe 4-6. So I decided to let them be for a little no water, nothing but the usual light schedule of 18/6.

Now the soil is dry at the top, about an inch down. So that is why I am here.

If it is the nutes, then what should I do next... Flush?

I would edit my last post but for some reason it is not working...

I will take back what I said about the root bound. I think I will repot into 2 Liter bottles for the time being. See if this can help them girls (hopefully) get healthy again!