So how old are your plants and how many you got.
How many nodes?

What lighting are they under now?

ime using 250 hps

What kinda soil?

fox farm perlite mix


Do you got any ventilation or fans?

using a 100 cfm w/ can exausting 24/7
400 cfm exhausting 250 hps 12/12
small fan blow in closet

How often ya watering? Are you really lettin that soil dry good? Ph?

Using any nutes?

using botanicare pure blend grow 1/2 dose maybe

Just seeing where you stand
You've still got plenty of time w/ em and it looks like the plants are doing all right.

just letting ya know what ime using here,

doing an apt. closet grow

Your plants are not a lost cause and they are still young you say they are under 12/12 now for what 5 days thats fine if your lookin to get little guys but nonetheless we need to figure out a way to get these suckers jumpstarted if you wanna get much out of em especially since they are 12/12. O.k. I see what lights and stuff your using but I'm confused with so many.
First do those plants got any ventilation, the closet your in is big enough but I think with doors closed to prevent light leaks sounds like no ventilation, could be wrong.
Are you allowing those puppies to dry out well between watering, may be worth it to if not sure to gently pull one out of the pot to make sure they are drying if it's soggy wait on water, your roots may thank you.
This lighting setup you got, are they close to the tops of the plants, within inches or what? Are you having any heat issues, whats the temp w lights on at plant level?
Yes and have you checked the ph of the water your puttin in those bad boys or girls? Test kits are not very expensive.

As far as 12/12 goes are you interrupting dark periods?

From what you said you may have a female, thats good and if you r not sure youve got time. Oh and sex may not show for a little while, be patient and about keeping the plants, why not with sex yet undetermined on a few wait before you just focus on the one and keep em all alive, cus you may have more females and cus those plants are still small, so maybe the more the better.
Nonetheless I am no expert, but thought I could help a little cus my sichuation was similar to yours. Let me know whats up, dont think those are a lost cause, still hope.
Oh yeah t5 or hps, the hps will help you in flowereing but those bitches can be hot so cooling it will be important.