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Stress maybe, those three fish shouln't be in that small of a tank. Your best bet is to leave the tank fallow for at least 6-7 weeks. I would fire your fish guy too and ask around this site before you spend more money on what they want you to buy for a stock list.
By the way, a boxfish will/can nuke your tank if stressed or killed.
Also, I am not aware of a boxfish that should be in a tank smaller than a 50-70G tank (at least not off the top of my head).
How old is the tank?
What are your actual water parameters?
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