Sounds like a wonderful setup! I was told that different patterns would school together when I first started with Cories, but it's unfortunately not always true. Corydoras is a genus and the different color and body types (Julii, peppered, panda, etc.) are often different species. I think a lot of the albino corys in chain pet stores are just the albino form of the peppered Cory(C. paleatus). Do you have peppered Cories or were they sold to you as Julii/false Julii Cories? It would be interesting to know if they refused to school up even though they are probably the same species. Try planetcatfish.com for more info, by the way, it's a wonderful resource. The South American Catfish board is pretty much all Cory talk.
I'm happy to hear everything worked out for you! Be careful with the catfish, they get addictive.
Proud mom of Samuel, the red, white and blue VT and Darius, the purple and red HM.
Samuel's Tank Mates:
4 peppered Cory Cats
1 Siamese Algae Eater