Well I will be moving to a bigger tank when I move to my new place in July. I probably won't do the tangs till then. I am planning on taking my 90 gallon and turning it into a gigantic sump, getting a 120 display for my room, and getting a large rubbermaid holding pond and creating a shark/ray pond in the back room. Plus I will be looking to get my hands on some of those fish display tanks (like they have at the pet stores) that I can run with a UV clarifier and Ozone to create a mutual water QT area. Everything will run from the 90 sump and I figure all the water capacity will make everything pretty stable.