hi medecine
well i think personaly that if you have differentes plants at diff ages you must put light regimen at 18/6 cause like this every of them have anoyugh light for grow or flower and electricity bill is not so high
the humidity will be at 35/45 max during this time, try to ventilate the best u can.
I seen your videos on youtube and it's lookin very nice mate...!
for the onyx just try to feed them very well...
i have no much time coz i'm in mexico looking for new strains....so i don't have internet at home here
i'll be back in few days to give more advises