You tank length is fine for both as long as you have plenty of filtration. What's the width of the tank? This is also important especially with Aros.
As for the Feng Shui of your question...Dragon, Tiger, and Phoenix is what you want and those fish are described as Arowana (Asian preferably if it is legal to obtain) as the Dragon, Datnoids (again...if you can get a Wide Bar, it is preferable), and Fei Feng as the Pheonix. I don't believe that CKs fall under the Feng Shui scheme.
More shots of the Aro may be needed, but the back seems slightly bent.