Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
When I build stands for 48" long tanks I may or may not add a center leg. The stands that came with some of them have a center support, but I feel the cabinetry techniques and materials are a bit wimpy, so the middle leg is important for that style.
I built a stand for my 72 gallon bowfront (48" long) with no middle leg, and it is just fine.
I only have one tank that is 60", and it came with a stand, similar in concept to your picture. There are 2 doors, and the space between them is the front-middle support.
When I built the stand for my 125 (72" long) I made 2 internal legs, so there are a total of 8 legs: one at each corner, 2 front and 2 back 'middle' legs. Actually at 1/3 and 2/3 of the spacing.