OP,
i too have done the same. it took me 3 weeks to get roots out of the girls but it was all my fault.
the container i used was letting light in big time.
testing for light is easy just take a clone so you can see inside, if it's not dark inside you have a light problem.
you'll need to cover the walls and lid of the container with black bags until you can replace it.
the other problem i had was that some clones rooted faster than others. the rooted clones wanted nuts and the leaf tips turned yellow.
you can use a tablespoon of bloom nuts to feed them.
out of 80 clones 79 root now. the one that dies is because of my spray system, it doesn't get to it so i'm just going to run the air line into that hole next time.
also you may want to swap around the rooted clones with the non rooted ones i think that sometimes some spots are better for the clones to root than others, it maybe the way i cut them but it gives me something to do too
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if after 6 hours the clone is standing that means it's getting water and it's ok. if after a week there's still no roots i'd be thinking of light leaks or ph (best not to let it go a week). but you have to keep an eye on the ph too and don't have the sprays 24/7 because you want them to go looking for the water 15min on and 15 min off is fine, you can even turn off the pump at lights out too but i like to have a mid night spray after 2 hours (just to keep them wet) there's is another problem i noticed with the 24/7 systems, the pump heats up the water too much, you don't want to cold but you do want to try and keep it around room temperature
imho i think it's best not to use rooting powder in a homemade aero cloner. i have tested it on mine and i get better results with just gel on the steams and plain water (ph fixed). i tested with just power, with just gel and a combo of power and gel. the one's that turned out the best results were the gel only clones. it maybe a brand problem but your better running your own tests too.
i was getting the clones into veg midway week 4 (3.5), but now midway week 2 (1.5)they are ready for veg.
hope this helps.
happy growing.