What type of albino cat? Long whiskers, with large eyes and a long body, or little barbels, smaller eyes, and a taller, thick body? If you have an albino channel cat, you'll want to get rid of it--they get huge, arund 3-4 feet easily, and will eventually eat everything else in your tank. If it's an albino cory, they too do better in small groups.
Danios do better in groups, but they are very, very active fish, and a group of them will disturb the more sedate cardinals. I would pick one of them to build into a group and get rid of the other.