Congrats on the new boys and the new tank! I bet they are happy to be out of those cups and in a warm, clean environment. xD
However, I'm sorry to be the bearer of bad news, but a 2.5 is much to small to divide as a permanent home. To divide for two fish long-term, you need at least a 5 gallon.....so if you don't have room for another 2-2.5 gallon tank, it would be best to upgrade to a 5 gallon in he near future(like within the next couple of months). If you can't upgrade, and you can't get another tank...it would probably be best to just return your second fish.