Did my SEED ROT? =o first grow.

Ok im silly tried to prepare for everything but failed,mistaken humidity with clonning and veging which needed is 60-70 and did 75% for germ,got it down in like 30 min tho cus I imediatly went to google to check if I did ok,and it wasnt ok.Before was hum at 50% steady.So now I saw this black seed root,did it rot? Heres pics =
http://postimg.org/image/9qtcijytp/
http://postimg.org/image/pg4hirg99/
http://postimg.org/image/xzjlb6vp5/

I will be planting them tomorrow since they already show.Not sure what to do with the black one..Any ideas?

The black spot kinda looks like a piece of the shell casing. I would be more worried about the tap roots that look yellowish. Not much you can do when they are that young maybe a little ST with their first watering. But i think you will be fine.. Best of Luck

When the roots start to pop you need to get them out of the wet towel and into starter plugs. That towel looks a little too wet IMO.