Sexing

I have several new seedlings growing and was wondering what the best method of sexing them is when they get big enough, I want to clone all the females. Thanks

It all depends on how long you are going to veg them for. If you veg them for about 4 weeks they will start to show signs of sex. If you are not vegging that long the most common way is to put them on a 12/12 light cyle for a week. If you have any males they will show up.

If I put them on a 12/12 cycle for a week or so and remove all the males will they go back into veg ok without problems?

It will slow the growth a little but it will not harm them.