Does this plant seem sick or is in need of nutrients

More details please. What are they in? What kind of nutes? Temps, humidity, lighting? Age?

here's a pretty good pix guide with causes and cures..

http://www.growweedeasy.com/marijuana-symptoms

just look at the pix for what ever one is the closest to what you have now..

At racerboy thanks 4 da help it really helped out

also check runoff ph as it could also cause lockout

looks like a calcium deficiency how old are they?
whats the lights on veg or flower looks like start of flower or you should start lol
what soil are you using i hope not miracle grow
what Nutes if any are you using?

Im using roots,organic soil I feed them fox farm nutes 600 watt metal halide temp is 75-76 and they are 6 weeks old

do you water your plants everytime with nutes or like nutes then plain water and plain water again?
also whats your PH it could be PH lock out check the PH run off to see the ph of the soil

I water plain water once den nutes den plain water again and run off is at 5.8 snd I feed at 6.5 ph