Help with seedling!!

ok my seedlings are about a week old they were doing really well up until today the lower leaves are starting to turn paper yellow and looks like its dieing can anyone please help???

Always try to use pictures so we can see what's up. It MIGHT be those little sprout round leaves that first come up and they die off. Unless you have a pic we can't help.

the first two leaves are not true leaves and do turn yellow and flop/die once the sprout undertakes growth this is perfectly normal.
Cotyledon - Wikipedia, the free encyclopedia

With the yellow leaves, you are not using any nutes are you?

Also do you have any pictures?

you can see the cotlydons on this plant.

no my plant is much smaller than that and still only has the 4 leafs not including the round ones the first 2 actually marijuana leafs are turnin yellow at the ends......now wen i started i was dumb and didnt know what i was doin and had some unknows soil so i think that soil may have has nutes in it that burned it but i switched my soil to schlutz seadling soil i dont know the N P K id have to go check and far as pitctures go i dont got a digital camera im gonna be using my girlfriends tommorow hopfully i just gotta put a program on my comp for it i tink im just gonna restart i just got some new better seads AK-47 autoflower and a strain called 5th wheal there already germinating hahha so i donno i got a pretty cool set up now and rather go some weed worth while haha soo

what you are saying just sounds like tip burn(no big beef)just a heat and light issue.
never give any nutes for the first 3 weeks of veg and use neutral soil(7.0ph)and all should be good.

Marijuana Plant Abuse
this might help.
Troubleshooting marijuana growing health problems.