I like it also, it looks clean. A few tips would be to put that heater parallel with the sand in the back so that the driftwood/rockwork hides it.
Also, it looks like the tank has a pink bulb in it, a full spectrum white bulb would make a world of difference in the general tint of the tank if you ever want to change it.
And finally, get more plants, fill it in, it's looking fantastic already but will look even better when it gets filled in.
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