Whats wrong now :(

Hi guys and gals...ive been growing for a while now with no real problems, apart from spider mites a few times lol

My plants seem to be yellowing at the tips of the leaves and curling up?
They are in veg....ive fed them with plain water and seaweed extract for the last 2 weeks. I did give them some nutes about a week ago...just some tomato feed to help them grow bigger.
(i use Advanced nutrients in bloom)

Ive posted some pics....could it be nute burn?? Ive took them out from under my 400w hps and stuck them in the bath encase i need to flush them.

So...without further a do heres the pics...any help would be much appreciated

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their fine probably adjusting to the new feedoh and the plants to hot check the temps for the curl

hmmm i dont think they are fine lol....if they were fine they wouldnt have yellowing of the tips and be curling over
Im inclined to think its nute burn despite the low dose i gave them
Theres so many things that look the same....ive read somewhere else it could be magnesium deficiency or a humidity problem

no worries people i have just flushed them all to be on the safe side and gave them a dose of seaweed extract for the roots
Hopefully this will solve the yellowing if not then il get some epsom salts and give that a go

Bit hard as can't see rest of plant.
I agree and think it could simply be a adjusting to the feed
Personally I'd flush and stop with the extract and also cut back on the water.... as I said can't see rest of plant but they are looking slightly droppy (maybe too much water.)
Looking at the pic I WOULDN'T worry quite just yet.

i only water them when the soil is dry (about 2 inches of dry soil at the top) the pics were taken this morning about 20 mins after the lights came on and the soil was very dry....i think they were needing some water to perk them up lol
Il upload a vid of them....give me 30 mins as it takes forever to upload on youtube for some reason
EDIT: Cant take a vid at the min as the lighting in my bathroom is pretty naff....gonna let them drain off for a bit then il stick them back under my light a bit later on....i can show you a vid of them from last week though
They have doubled in size since this vid

[video=youtube;WPbnDHztwmk]http://www.youtube.com/watch?v=WPbnDHztwmk[/video]

They have really drooped now....think the water was a tad too cold for flushing them Oh well....im sure they wil bounce back once they get under the HPS lol just need to let the soil dry a bit before putting them back in under the light.
I did have a vid i took about 2 days ago but my computer went wonky and i had to reinstall the operating system!! Lost all my vids, pics etc from my other grows...only just realized