Cheylilmama, it wasn't meant as chastisement - we all care a lot about fish here and want to help them and you get the maximum possible enjoyment out of them being your pets. :)
I think your solution with the tank switcheroo is a good one - the julii will love the space of the 55 gallon, and the pandas will be alright in the ten. :)
You are also right about sand being best for the cories - when I had pandas and gravel, the poor little things had their barbels damaged before I realised what the problem was.
Beware that pandas seem to be the most sensitive of the cory species when it comes to stress - acclimatise slowly, pack them securely for the trip from the petshop, and give them plenty of hiding spots. :) Luckily, they are also one of the cutest species, IMO, so they make up for being fusspots.