Super Skunk Autos Seedlings looking weird. Little help please

So Im doing an hydro setup for the first time... My ladies are still seedling so I jave them under 2 (2FT) T5s HO UNTIL I move them into my cabinet with 600W MH.

Anyways the oldest is about 2 weeks old the rest are a little older.
Why is the are the coloylodon leaves turning yellow... The new growth looks mangled as well... Is something wrong with her? The next oldest has some brown spotting on the tips of the leaves... Whats going on there? The rest of these guys are taking a long time to pop there little heads out.
Should I put the oldest one in the cabinet to flourish?