I do like the decor of the tank, has an Asian/Feng Shui kind of feeling. Unfortunately the sharks will get bigger as the tank, and even just 2 goldfish will be a challenge. Fish don't adapt to the size of the tank, they either die early or grow out of it.
This tank would work if you re home all of of those fish, and get similar looking fish that stay smaller, like rosy barbs for the goldfish and a red tailed or rainbow shark for the iridescent sharks.