Clown Tang
If it is a 4' tank (sorry, don't know my cm to feet) it is probably not going to do well in the long run, but neither would the Lipstick Tang. The general rule for Tangs is 6' minimum length due to all the swimming they do. The width of the tank also needs to be considered, as many Tangs get over 12" long.
The anti-Tang police can say what they will, but I feel you have an "expert only" fish in a tank about half the recommended size. If it lives, you will also have to deal with territory issues with a fairly aggressive fish in a "too small" tank.
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