you could probably do it. It would be worse to go from 24/0 to 18/6. personally i prefer 18/6 but if you do want to go to 24/0 consider something like this.
the plants are used to some dark right now, switching immediately might give him more males or hermies. they say 24/0 gives you more males but who knows.
my only 2 plants grow slowly.18/6 in my case its not good i think.Yesterday i turn my lights 24/0 and she's fine look good later i post some pics to seee ya!! peace and love