Purple Haze hydro prblem

I have a purple haze in a hydro, stealth grow. I have 6 plants total and the only one doing anything wrong is my Purple Haze. It seems to be the only one dying. The rest are flourishing quite rapidly. Any suggestions? The plant is a good green color but just super droopy and almost wilting kind of look. Roots seem to be ok. They aren't taking in the netting cup like the rest. Any help would be appreciated almost to flowering. Thanks.
 
Top