You could always paint the outside of the tank black or something, although that is ruining the tank if you ever wanted to use it for something else.
Or you could of smeared the walls inside with black silicone, but it sounds like your tank is together so that might not be an option, other then that look through the gallery at some tanks, alot of people just leave it showing, i personally didnt like that so when i built my tank i left about 5 icnches below the glass.
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