help my babies

[sc0usa]

can ne1 help me? my plants are about 4 weeks old now and all of the bottom leaves are turning yellow quickly,my ph is 5.5,im using a hydroponics kit with a 400w grolux lamp,rockwool cubes and i have a fan on so they are not burning , but im using "power-gro" nutrients,the bottle says it has nitogen in it so can ne1 tell me what im doing wrong?am i using the wrong nutrients?

[monty python]

Too much light maybe? Put them under a fluorescent if they're only 4 weeks old.

[SativaTrip]

I don't do hydro but usually people say that if this is happening with soil or hydro that it might be 'fert burn' or too much nutrients. Check and see how much you need. Good luck!

[sc0usa]

ok thx lads ill try it now :)

[KillaBuzz]

yah dude, id lay off the chemicalz, soundz like a chem burn 2 me. it cood b anythin tho, however i dunt think the lightz wood b a problem at 4 weekz unless they are too close in which case they will cause the burnin.
PeAcE