Yikes...not good to hear. I think I'm definitely running a UV on all my tanks going forward. When stocking the 66g I didn't have one outbreak of anything. Cross my fingers...6 months in and everyone is happy and healthy. Actually today I'm switching out the old one which will go on the new tank and installed the new one on the 66g. Doing the switch only because BRS quit selling the 18w so had to go with the 25w and it's YUGE!!!! The old one will fit nicely behind the sump in the stand of the new tank.