Pandas are pretty sensitive to their environment and don't always fair well in many communities. They are small, though. A skunk group doesn't get much larger, they are black and white, and are hardier. They will get along well with pandas if you added them later. I doubt that any of my small Cory groups are even two inches.
Please add your fish slowly giving your tank time to mature with each group or you could end up with a crash. I use BioSpira to fast mature tanks. It is very expensive, but with a seasoned filter and decore the fish do well when I add new ones.