Above is a 1st grade blueprint of my tank. Im just having a little trouble trying to figure out the dimensions where the question marks are. I was thinking three inchs in all the way around. Also three inchs for that center support you see.
well cant find a pic of what im talikin about...so what im tryin to say is put 2x4s om the inside of the walls and under the top put 4 of them 2 on the edges and 2 in the middle evenly spaced out....put them to where you can fasten them by both out er boards to one support beam