they seem to be stretching a bit you can put some more soil in the pots for a bit more support. what kinda lighting are you using? it might be an idea to move your lights a bit closer to the plants if you can do that without burning them
yeah i started out wuth the lights to far away, but i have recently put them closer, i am currently using flouros but my new metal halide setup is on its way here
if they start falling over get a straw and cut it about the length of the stm to the first leaves (the round ones) then cut it down the center, pull it apart and wrap it around the stem the pust the straw into the ground. (someone elses idea I used on my plants just to keep safe)