Need Growing Help! Please!

would greatly appreciate any advice ..currently growing five plants ..on the biggest one leaves are curling up at the top and curling down at the bottom ..the second biggest plant has browning tips with curling down leaves ..i am growing under a 40 W 4 FT gro-lux light and watering simply whenever the soil feels dry ..i feed the plants with 15-10-15 solution but only by spraying the plants a couple times a day ..does anyone please have any advice for my growing situation ......i would be devastated if my plants all died

it looks pretty good so far man.
if u have the money you should grab a 250w hps. if not then even check out how to do a nice cfl setup.

The little bit of browning on the tips of the leaves is probably nute burn but nothing to worry about just keep your eye on them. A little burn is ok

I would also sugjest you get a hps light if nothing else...You can get some at menards, home depot...for around $30

what exactly is an hps light and what would be a good wattage to get? im also real curious as to whats happening in the 3rd pic i posted ...the plant looks nearly destroyed and im lookn for some kinda explaination ..thx 4 da help so far and more would be greatly apppreciated

oh and i also wanted to ask how far along are my plants ...they were given to me and im a new grower so i hav no idea how far along they r

Mh = metal halid for vegative growth

Hps= High pressure sodium for flowering

If you can I recommend getting both...But if money is an issue get the hps

Try looking at menards, home depot you can find them for about $30 a piece (but you also have to buy a ballast).

Oh by the way WELCOME TO RIU! Be sure to read the grow faq' good stuff in there!