I just bought two new fish today, a female veiltail and a baby. I've ordered tanks for them online, but they won't be here until at least Monday, and probably not until a few days after that. So I went through my closet and found two plastic storage containers and cleaned them with very hot water. One is 5 gallons (bigger than the tanks I've ordered) and the other doesn't say how big it is, but I'd guess it's about a gallon. Would those make good temporary homes? They don't have heaters yet either, but I think I'll let the baby borrow a heater from one of my other fish's tanks.