Planted Tank Guru
Join Date: Nov 2009
Location: Missouri united states
I would be inclined to choose longer tank.
Larger surface area for oxygen exchange at surface and can add a few more fishes than bow front or cube style aquariums.
Have heard that flounder's need tank twice the width of adult size, and longer by twice the fishes adult length.Plenty of filtration is also suggested.
Is said they seldom do well for long otherwise.