I would like to discuss my theoretical one day tank. In a couple of years we plan to move, so I have to wait to do this one. I want a school of Powder Blue or Nasso tangs. Anything else would be based around this concept. The idea is to build an aquarium around this idea. My husband is going to practice building stumps and tanks that are smaller for now. By the time we can do this tank he should be ready to try one that's thousands of gallons. I'm thinking maybe something like what DIY Fish Keeper has for his rays. Is a couple thousand gallons enough for school of these fish as adults? Is there any likely complication I'll run into other than ich?