Thanks Otaku, I do intend to put a rock on the left side for a zoa island. The dome shape rock was supposed to be more to the right so that I could have a bigger zoa island. I am just disappointed that I can't maximise the lighted area to put corals esp the part in the last picture which is grey and shaded from the light. Not sure if there is any low light coral that I can place there.
Don't worry about being artistic, I am also not really there. That's why seeking assurance that I can salvage this.