Hi mate

How long did you veg them for and how long have they been 12/12 ?
Depending on the strain you are growing, it could take up to 2 weeks of 12/12 before you see any changes
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Mean while my full plants are taking over my space and I had to trim preaty much all the large sun leafs, living only the stems and all the new braches, wich some will become clones when their sex is reveled.
If the 18 plants you have are too much for the space you have then you should have removed a few to give the others room to grow properly.
Stripping off all the sun leaves and just leaving the main stem is the wrong way to give them more room and you have probably ruined any chance you had of getting a decent harvest, if they don't die of starvation first
without any leaves the plants can't photosynthesize.