A couple weeks ago I got 5 Julii cory's. I researched them white I was at the store to double check that they weren't False julii's and they aren't.. One died after a couple days but the other 4 are going strong! My Parkinson rainbow thinks he's a cory and follows them all around the tank.
My 5 pygmy cory's are in the 10 gallon with my betta now. He grows at them and they flitter away.. only to come back and antagonize him. He's realized that they're no threat, and just looks at them funny. They're way too quick for him.
This betta is wierd, he won't attack anything. He leaves common pond snails, and his nerite alone. I took a gamble with him and the pygmy's and it's working out well.