[R-Wells]

Is there a Ideal cathode size.
Using LCD, my tanks size is about 18"x24" , the depth of the electrolyte is about 13" deep, 13 gallons of electrolyte. ( not exact measurments)
My parts range from about 4 sq inches to 400 sq inches.
I am cosidering using aluminum sheet 0.190" thick, one on each end of the tank.

What would be a good cathode size?

Thanks
Rusty