New to site New to growing.

First off i should say hello and say thanks for all those before me who have posted useful threads and posts over the years that helped me start off my first hydro grow. I have always been a fan of germination so that is where is started. After my seeds first root was about an 8th to a quarter of an inch long i planted them in the AG's sponge medium. I have added no nuts yet and i got my first two sprouts today at the end of day 4. I plan on trying to grow two to four female plants in the set up if room allows for this. The main reason for this post is that my sprouts leaves are yellow tipped. In soil this is normally a sign of to much sodium in the soil but since i have not added the nuts yet ( being its week one ) why would this be?
 
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