Close up of where the tank will go

The wall will end about where the picture on the left side ends. It'll come out about 6' from the wall and then the tank will be in the middle of the wall. The large white container is the water storage tank I bought to move tanks out of school. I decided to keep it for RO water and will consider putting it up on a stand over the sump (which won't be kept under the tank). The container holds 125 gallons of water and was nearly full a month or so ago. The garbage can next to it is a 44 gallon Rubbermaid Brute that will hold additional live rock. I've got a Little Giant 2MDQSX on a "closed loop" to keep the water circulating.