Both powder blues and clown tangs are pretty hard to keep, lots of people have gone through the same thing. I'd avoid those fish and go with something a little easier until you're a little more experienced.
The solution isn't a bigger tank, just start out with some easier fish rather than the super finicky ones. Also when you're starting out a decent size UV sterilizer can help avoid problems with ich, for example if you had one the ich MAY not have come back.
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