Have you ever tried using the 42 LED version on the 6 gallon?
I did that and the lights are still very lacking, surprisingly the 42 LED on the 12 gallon puts out more light it seems. Very weird results as one would think putting more lights into a 6 gallon will brighten it up.
Also, since you seen a lot of Edges tanks, do you find the newer ones are of lower build quality?
My 12 gallon have very poor silicone and the corners are buffered down, well one of the corners anyways.