There has got to be another fish you would like just as much that you wouldn't have to trade in? I had a naso in my 120 untill i took it down and yes they are beautifull fish but putting one in and then taking it out is to stressfull on the fish and you are going to risk ich and other diseases everytime you do this.Start small and work your way up. We all can't have what we want in our tanks and if we do then we have either gone up in tank size to do so or sacraficed something else. This is not the hobby to just go on a whim. Think about the best interest of the fish not what you really want. I have a kid your age and she is the same way with the naso but had to suck it up when we moved to the 90 as it just isn't big enough. They need a lot of room to swim and move about to be happy.
just my .02
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