We are going to be building a new house in about a year and I've been going over house plans to include a fairly large fish room! I will not need to have space under the tank, so I was thinking of building a solid concrete box with 1/2" rebar in it for a stand! So what's everyone's thoughts on this as well as what would size would the ultimate fish room be? My plan is to have a reef tank on one wall and a predator tank on another wall! The 500g reef tank will be first, but I want to build everything so if later I decide to add the other tank I will have ample room! Any advice or comments are greatly appreciated.