Laurie, the cube is lookin' fine. You could move the Copperband to the cube for awhile if he's not too big. He'll gobble up them Dusters.
My CBB is too big for the cube, and most likely he'd eat the sps and not just the feather dusters Plus I've had him for 3yrs and don't really want to move him around and upset him.
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One more fish should be ok?, right!!! - Laurie