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Saltwater can be very tricky. I sold my reef tank almost 15 years ago because of all the work it required.
Aside from finding them dried up behind the tank or under the live rock this is what I would consider:
What sort of temps are you running?
Does the temperature fluctuate at all?
how often do you do a partial water change?
What kind of salt do you use?
What supplements do you add (if any) to the water?
What sort of lighting are you using (mostly important for inverts and rock)?
I would suggest testing for nitrite and nitrate as well as ammonia. These levels should be at zero for ammonia and nitrite; nitrate should be kept low, below 40ppm at most. Any spike in the ammonia could indicate a dead fish hidden in the tank or overfeeding (similar situation for nitrite). excess nitrate is from the water not being changed often enough.
Your pH should be sitting in the 8.0-8.6 range.
Also, keep in mind that a small cube will be more difficult to keep stable than a 60 gallon setup.
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