Im growing two seeds right now and both are under the same conditions. Im 4 days into growing and one is doing great but the other started to grow just a little the first day then stopped. Its been the same for 3 days and hasn't started to rot or anything. Its only grown a few centimeters and it has the seed shell on top of it but it seems healthy. What could be the problem?
Yeah, the empty shell can sometimes prevent the true leaves from popping out and growing. Take it off (gently!) and the leaves should begin growing. Aside from that, some plants just grow differently than others, even those of the same strain.