18/6 or 24/0. Either one is fine. Sex is genetic. Only extreme environmental stress could potentially cause male-ness or hermi-ness. 24/0 is fine but it has nothing to do with the sex.

It's doubtful that changing your cycle would have a bad effect...just look at nature. Unless you're at the equator, days get longer as you approach the summer solstice, and shorter as you approach the winter solstice. And plants still seem to grow ok in nature.

Dboy