They are currently in a 10 gallon with some endlers, but their parents are in my 40 breeder (which is more then enough space). They will be okay in a 10 gallon for a bit longer, however I've noticed that they will grow much slower if the tank is small. If they are like the parents, they will start growing like crazy once they are given the space.
Laudy, I've never shipped (or sold!) fish before, and I would be heartbroken if they died on their way to you.