Congrats, Doni. Beautiful looking horses you have there.
Bob was already pregnant when you got him. Their gestation period is 14-21 days with most being closer to the 14 day mark.
Also, you don't need a kreisel for them, you can use one but it's not really necessary. You can raise them in regular tanks. The key is to keep them off the bottom of the tank, not the surface. And be sure to keep the bottom of the tanks clean to reduce cilliates and protozoa which are harmful to the fry.
There is an article in the library at SH.org by Dan Underwood on raising erectus fry. He uses the same set ups for his reidi also. Only difference is hat reidi need rotifers for about the first 2 weeks where as erectus can be started off with newly hatched artemia. If you need a link to it, just let me know.
Congrats on the babies. I hope you do well with them, just be warned that reidi are one of the more difficult species to raise but since you already have the rots going you should do just fine.