I maximize space below, there's never enough space. Below my standard 75 gallon is a 40 breeder (wood frame stand), that fits in the same foot print. If I were to use an iron stand, there would be a 55 gallon tank there. Below my old standard 65 gallon, there was a 38 that fit in the same foot print. Need more space for refugium, frag racks, isolation holding, etc.