did you transplant it? maby a change of soil will help. try not to use the same soil, and see if that helps. maby there arnt enugh nutrients in the soil that your using. try adding something with a nitrogin content, maby that will promote growth.
I dont want to get into an argument about this with anyone, but im not a verry big fan of the soft white CFL's that plug into a lamp socket. it dident work for me, infact, my babys looked similar to yours, will all the yellow growth. when i switched to plant and aquarium, 24in CFL's ( 2 of them ), all the new growth was green, and the ladies veg'd fine like that with no more discoloration.