Did you move your light closer or something? It looks like it was stretched by the really long stalk but the top looks bushier. Also, is it in tuperware? You should use something taller, not wide for your next one and when you transplant this one.
Looks good tome, how many what kind of lighting? Did your potting soil have nutes in it? I dont see a nute deficiency, in fact looks like a slight nute burn, thats why I asked about soil.... Hang in there, there fine.
Here's anew pic it was a bit stretched but also had to cut 3 pairs of leafs cos of magnisun diff went yellow the white then curled up n died still got a bit if problem with yellowish lower leafs like in pic any surgestions in what it may b. I'm using 2 26w cfl dayligght bulbs 1 15w cfl daylight and 1 26w warn white cfl all on 1 plant an a 80w tungston halogen I'm getting bit worried bout the yellow .
Ps yep its tuppa wear .