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Holding method for Macropharyngodon bipartitus not good, without sandbed/box

There has been debates on whether UV helps clear Ich, with no definite conclusion. Theoretically, for UV to work (if it works), ALL Ich cryptocaryon must pass through the UV lamp. But consider how much water is being pass through the lamp at any time. The probability that ALL Ich passes through after a definite amount of time is limited, thus not very effective. In addition, only when the cryptocaryon is in its free floating stage, would it have a chance to be pumped through the UV. Also, most UV are sized to kill bacteria and algae spores, not protozoans. Meaning, the size of the crytocaryon is too large to be killed by a standard UV, unless the UV dosage is very high and flow is very low to allow enough exposure time to high UV. But then, there's no harm trying.