If I could upgrade and get any tank I wanted it would be a Red Sea REEFER 3XL 900 Black a lot of corals and fish could go in the tank and I love the hobby it has everything ready to go and I have the ecotech lighting, Skimmer, return pump and ecotech wave makers and I could sit in front of it and relax and just watch everything in the tank because it’s relaxing, calming and a good stress reliever to just sit and enjoy all the life in the tank