After years of using lumber to support my aquariums, I opted to free up space beneath the 400g with a steel stand. This one was designed to support the full weight of the tank, and it included a walkboard for easy of maintenance.
The steel stand was an absolute necessity with the new aquarium. For almost six years, the 280g reef was supported with 2x6 boards and two sides were blocked by the wall. This time, full access was my goal, from all four sides. Steel takes less space, is stronger and looks nicer.