Some more progress I made. The tank is stocked as the water has been cycled and I used the sump from another system I disassembled in place of this tank. The left side of the underneath is still bare as I plan to put another tank there as a freshwater reservoir and the 2 HOB skimmers (behind pikachu) are just because I had them on hand, may get a full size skimmer later on but I quite like those skimmers.