ok so lets get this straight, you only transplanted one out of the three? what kind of mix is your soil? cause the first time i ever transplanted seedlings, i thought i made a really great organic mix but it turns out the chicken manure i used was too hot and i burnt the shit outta the little gals. until the seedlings have 4 sets of real leaves don't fertilize and keep them planted in just plain old potting soil with some perlite or something. i seed in a mix of potting soil that has sand, perlite, and peat moss in it, then i add some more perlite to it so it's almost 50%. they love that stuff! so i would say u gotta re-evaluate your soil until they're bigger.