I think you are headed in the right direction, tank is improving nicely! I'd try to get some kind of tall plant for the back, or maybe put a piece of black posterboard behind the tank.
I had my HOB on the left side of my 29g to try and minimize the visual impact of it's intake tube like you had on your tank, and I too moved it to the middle. Shame it has to be there to get good flow throughout the tank.
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