Yellowing lower leaves, drooping leaves, and now deformed new growth on seedlings??

Hey, this is my second grow, growing Snow White from Nirvana.
Budget set up atm except for a 400w HPS; using some soil from the garden, (it had been mixed with some compost a while ago), waiting for perlite for when i re-pot it, in pot noodle pots with plenty of wide holes cut in the bottom. Basically we noticed a while ago that they seem to be growing pretty slooow, they are 2 and a bit weeks old right now and im pretty sure they should be a lot bigger... They have droopy leaves and the lower leaves are yellowing a bit. I thought it might be an N deficiency so we added some half strength N fert yesterday. Anyways we thought that was manageable but i just checked on them and the new leaves growing out of the top one of them are all twisted up looking :-/ i havent got a pH tester yet so i was thinking maybe the pH is off? We have been watering them every 2-3 days with tapwater. I'll post some pics in a minute if anyone is interested in helping, cheeeeers x
Oh btw are they still counted as seedlings? they're 2 and a bit weeks old but they're pretty small...

I had twisting leaves before. When it happened to me it was a combination of heat/light being too close/and a nute problem

The light is like a foot away, and they have only had one small feeding of nutes, from what i have read i thought it was N and maybe P deficiency, i dont have any money to buy nutes till next week though. Also is there not a chance it could be the pH locking out nutrients? i dont know why the pH would be off but i dont have a testing kit cos again i dont have the money yet lol.
Do you think my light is too close then? (400w HPS)

18 in. away from small plants. ph could be your prob. most likely!

benny blanco said:

I had twisting leaves before. When it happened to me it was a combination of heat/light being too close/and a nute problem

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Benny from the Bronx? Im gonna get you for shooting Carlito.