You can use them now at any point but you want to make sure that you don't use ALL of one size so that you have a continuous supply of new ones coming up behind that :)

Whenever you like really, depending on what size your feeding. I would never feed off all of one size though because you'll want to end up with a Colony of all sizes to have continuous generations growing up. :)

Absolutely! It's what we use as well :)

What Sandra K. said ;) Our Roaches are in full breeding force between 85-91F. Also Frass/Substrate is a big thing for Discoids. If you have any check the Substrate because the babies will hide in it and you won't see them otherwise. If you don't have Substrate please consider getting some as Discoids are a burrowing roach and breeding will amp up with it.

LOL well at least here we can keep it all in one place you know?