Wth is this!!!!!!!!!??????????

Ok, so after more than half of my plants died in my first grow on crappy MG soil, i decided to plant new seeds. About two days ago, my first one sprouted and this little seedling plant is right next to it!!!???? i dont what it is, should i kill it? transplant my plant? some help please.
sorry for the bad quality pic but the little seedling is located on left side of the pic, idk what it is!!... thanks!

lol man it looks like a blade of grass or something just kill it

lol i was wondering maybe the plant grew in two parts, hahaha... aight thanks man...