On the condition the UV unit is setup correctly. The flow rate must be within the recommended flow rate as listed in the manual. Otherwise there will not be enough contact time between the living organisms and the UV light. Too many people plumb it with flow rate too high.pncstod":2qiwdsjh said:IMHO UV sterilizers will kill free floating ich.
reefNewbie":2anjeobm said:Do Uv sterilizers prevent and cure ich?