can i switch from 18/6 to 24

my buddy just gave me like 12 clones and i alrdy have some mothers growing 18/6 now im wondering if i can change them up to 24/7 cause the clones (i only have 1 light (400w mh)) or should i be putting the clones on 18/6?

I run 24/0 with everything. it dose'nt hurt to move to 24 hour light

i recently made the switch from 18/6 to 24/0 due to cooler temps. so far i haven't noticed a difference, been doin 24/0 maybe like 4 or 5 weeks now..

clones will veg perfectly under 18/6.. you don't really ever need 24 on. Plants like the opportunity to rest a little every day. I keep mine on 20-4 until about 2 weeks before flower. at that point i take it down by an hour a day till i get to 12/12. flowers seem to set and show sex much sooner if i slowly taper the light down in this way.