What species of Cory do you have? At the moment that's a sub-tropical set up that won't suit most other schooling fish available to you as they're tropical.
As I said in your other question, you need to go one way or the other.
yeah that'll be fine its a monster tank, although i thought white clouds were cold water?
A great schooling fish are australian natives or rainbows.
http://aquariuminfo.org/rainbows.html
