Could someone please help :S "Noob hydro grow,DIY dwc CFL"

Hey guys whats up,freaking out a little today as i went and looked at my baby this arvo
after trimming her down a bit yesterday,
and couldnt help noticing something wasnt quite right.!
Uploading few pics!
The tips on some leaves seem to be diff colour,dry curling.also noticing brown dry spots on some leaves.
Few leaves were shrivelled up and basically dead. not sure if this is a part of the flowering process, thought i would run it all by you guys first! and tell me what yous think..?
does she look like she needs a stronger dose of nutrients?.. a flush? :S
Help is much appreciated.
cheers

my leaves curl or droop from being overwatered and leave tip can be from heat or nute burn theres gonna be some leaves that dont look perfect but thats how it always is

You have air stones? Is this a recirculating system?

got two stones in there! its not a recirc system! didnt really research that kinda jumped right on board silly me!
umm! raise the water level of the reservoir yesterday!!! it was quite high!! above half i think!!
and i woke up with em like this!!!

keep the roots ONLY about an inch or 2 in the solution.

Ok thanks dude! much appreciated!! my res is kinder small :S
as for my box its tiny aswell :S..!
cheers brother!!