If anyone didn't get it the first time, i......will....move......the......fish.......to......the.......180G.......when.....they........get..........too...........big........for.........the..........90. As long as the hobbyist has a plan for that fish when it get to big for that tank its FINE. I'm not buying a full 12'' hippo tang I'm buying a 2" one, in a 90G tank thats fine, for the entirety of its life NO.