Hi: This is my first post. I am also new to reefing. I have a 55g tank and have 2 mocha clowns, a fire fish, and a lawnmower blenny. I also have a torch, montiporas, and favia. Along with a long tentacle anemone. My daughter wants me to get Dory. I understand that after a while, I will need to upgrade my tank which I will do when it grows. I am ahead of the game by researching 120g tank AIOs. My question is if a 55g is even large enough for a 1-4” blue tang? From my understanding, they require a considerable amount of space to swim.