Linear fish such as rummynose are not advisable with angelfish. Other tank mates should be more disk-shaped as they are less likely to be eaten. And angelfish will grow. You do realize that they will get to six inches in body length, with an 8-inch vertical fin span?
For cories, increase don't decrease. This fish is always going to be more settled the more there are, and in this tank you could have 15-20 or more. Even with the angelfish.
On the Congo, these are indeed beautiful, but not the albino so that is understandable.