Easy man, what happened???? They were fine 3 days ago. To start with they look mega dry they need a drink bad. Re potting may help, i'd try it. put the lime at a ratio of 1/3cup per gallon pot your using. Try a 3 gallon (12 litre). I just did it with mine and they fine now, try to mix some perlite in there to like 40%max.
How have they snapped like that? Is that halogen light your using? If it is, it'l be way too hot and the spectrum all wrong, i used them back in the day, they just make the plant stretch.
Do all that then feed with your nutes, half strength. The ones next to the big halogen worst affected, at the top as well so maybe too much heat.