Help ID this

Hey guys i just want to know whats happening to my plants couple of them have leaves as shown in the enclosed pictures. These plants are 21 days old and i have just been giving water and no nutrients yet. Any info/help is greatly appreciated!

magnesium def bro. Time to whip out the epsom salt. Any pharmacy store near you will have it. Or if u haven't started putting nutes in yet, now is the time.

GL!

https://www.rollitup.org/grow-journals/268827-closet-ebb-n-flow-setup-2.html

this is my grow. Look at post 13... look familiar? except yours is a little worse.

thanks man! i'll start the nutrients tomorrow after i put them into bigger pots!

im not sure if its mag deffiency could be tho ..your better off giving them a decent feed then to go buy some epsom salts at this stage