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Bluelighter
If you want to figure out an early SEX test for your plants, you can force them into flower briefly by doing a 12/12 light cycle for a few days until you see their sex parts. Then immediately throw them back into veg light cycle (18/6 or 24/0) so they don't flower too soon. However, be aware that this method will drastically slow the growth of the plant as well.
The tall ones are probably male, so you could just keep an eye on them until they naturally show their sex and then do whatever you want with them (most people throw them away).
The tall ones are probably male, so you could just keep an eye on them until they naturally show their sex and then do whatever you want with them (most people throw them away).