It only kills stuff that goes through the UV sterilizer though...if your fish are sick, its not going to cure them.
I wouldnt run one on a reef. Maybe a large fish only where I figure that fish might be living with minor ailments, in a attempt to prevent the spread of disease.
I wouldnt run one on a reef. Maybe a large fish only where I figure that fish might be living with minor ailments, in a attempt to prevent the spread of disease.