AquaRick
Aquarium Advice Addict
On both my DIY stands I've done so far - a 125g and a 220g, I've used no middle support. Rather I went with two 2x4's at each corner of the build. I've made the two doors open from the sides and meet and the middle for the most accessibility to my sump and other items inside the stand. I used a 2x6's to build the top frame for the 125g and 2x8's for the top frame of the 220g tank.