Even tho you are familiar with cycling a tank, I am posting this for reference for you. I can never find the thread when I'm looking for it. http://www.tropicalfishkeeping.com/f...m-cycle-38617/
It is always good to have a resource/reference but you have to be able to find it. !! It's just me.
Now the little tank could be kept as a hospital tank/quarantine tank for temp purposes but there is no heater in it, they are plastic. It's nice to have a location when you need to remove a sick or dying fish, then your daughter doesn't have to see is.... ooops he's all gone... I don't know where he is.... ?
A Betta can go iin it but it's really small, they should have at least 3-5gal, but lots of people go smaller, and they do like warmer water too. ( I am one of those that don't believe in housing at a minimum thus my betta in his own 10 gal. ) JMHO
I've had two Sword pregnancies but still have not seen any babies. (And putting my swordtail into a birthing box.... omg she went nuts. She was so upset she kept trying to knock the lid off and final moved it. she would have stressed herself and died so back into the big tank she went.) I have 2 birthing boxes now, a net one and a hard plastic one and never used either for that purpose. My Swordtail is pregnant again....
We all spend money on this hobby that seems to go no where..... And we all make bad purchases, sometimes it's fish that were just wrong for our set up. We are all learning as we go... And who knows where this hobby will take you, it's an addiction you know. lol Good luck, hope the Guppy babies all works out. Let us know what she thinks of them!