Do you have drain holes on those pots? You need GOOD drainage. They look on the soggy side.
Also, the clear bottoms are letting light hit the roots... stressful to the plant... not good.
I see no sign of fert burn.
It was probably a little early to top them but get your drainage sorted out and they should be okay.
Transplanting into hydro? Hmmm... If I were you, I'd grow them bushy, take clones, adn get the CLONES going in hydro.