Hanna, I have MTS too. I got these tanks all within a year (it will be a complete year of fishkeeping for me on Christmas) and they're all in my bedroom. I'm so cramped!! lol but it's great having the company of my fish!! I would use your 10g as a goldfish tank instead of the 5g...
SlateSpider, I would get a Lee's 3 Way Breeder Box. Keep the fry in there until they're about 1/4-1/2 inch long. Feed them Hikari Tropical First Bites (you can get this at Petsmart or Petco). They will grow quickly with this. Dip the tip of the toothpick in the water, and then in the food. the fry only need a little bit of food so be careful when feeding them. PM me if you have any questions on caring for fry. 3 months into fishkeeping I bred my fish, and now, I can't get them to stop breeding. XD I've breed Mollies, Platies, and Guppies. I'm gonna try Swordtails next.